fix media embed advisory

Objective: Fix GHSA-qj6x-xx2h-8hvv by blocking unsafe serialized media embed iframe URLs while preserving valid provider embeds.

Goal plan: docs/plans/2026-06-14-fix-media-embed-advisory.md

Template: docs/plans/templates/task.md

Primary template: docs/plans/templates/task.md

Applied packs:

package-api (docs/plans/templates/packs/package-api.md)

Task source:

type: GitHub repository security advisory
id / link: https://github.com/udecode/plate/security/advisories/GHSA-qj6x-xx2h-8hvv
title: Media embed provider metadata can bypass URL sanitization and execute iframe JavaScript
acceptance criteria: the advisory PoC cannot produce an embed with javascript: iframe src; valid serialized YouTube/Vimeo/Twitter metadata still resolves through useMediaState; @platejs/media gets a patch changeset.

Completion threshold:

useMediaState recomputes or validates rendered embed URLs instead of trusting serialized provider / sourceUrl metadata.
Regression coverage proves the advisory PoC returns no renderable embed.
Valid serialized provider metadata keeps rendering through parser-owned HTTP(S) output.
Focused media package tests pass and release artifact is recorded.
Task closure is legal only when the source-of-truth acceptance criteria are satisfied or explicitly narrowed, required verification evidence is recorded, code-review and release-artifact gates are closed when applicable, tracker/PR sync is complete or marked N/A with reason, and node .agents/skills/autogoal/scripts/check-complete.mjs docs/plans/2026-06-14-fix-media-embed-advisory.md passes.

Verification surface:

pnpm --filter @platejs/media test -- useMediaState
pnpm turbo typecheck --filter=./packages/media
pnpm lint:fix
Source audit of packages/media/src/react/media/useMediaState.ts, media parsers, and package export impact.

Constraints:

Preserve existing user-facing behavior outside the task scope.
Prefer the durable ownership boundary over caller-by-caller patches.
Do not create PRs, comments, commits, or pushes unless the task/user/skill requires them.
Do not add broad ceremony when the task is trivial or docs-only.

Boundaries:

Source of truth: private GHSA advisory GHSA-qj6x-xx2h-8hvv, fetched with gh api repos/udecode/plate/security-advisories/GHSA-qj6x-xx2h-8hvv.
Allowed edit scope: packages/media/src/react/media/useMediaState.ts, focused media tests, .changeset, and this plan.
Browser surface: N/A for the package fix; the vulnerable behavior is hook/parser-owned and covered by unit tests.
Tracker sync: N/A unless the user asks to comment or publish the advisory.
Non-goals: public disclosure wording, npm release execution, PR creation, broad media parser redesign.

Output budget strategy:

Use focused rg/sed reads and cap large command output. Avoid broad generated docs/public JSON output after initial search.

Blocked condition:

Block only if package tests cannot run due to install corruption after the required reinstall retry, or if GitHub advisory access is revoked before confirming remediation.

Task state:

task_type: security bug fix
task_complexity: normal
current_phase: closeout
current_phase_status: complete
next_phase: final response
goal_status: ready to complete

Current verdict:

verdict: valid high-severity package bug
confidence: high
next owner: task
reason: advisory PoC matches current useMediaState fast path and registry iframe render path.

Completion rule:

Do not call update_goal(status: complete) while any required checklist item remains unchecked. If an item does not apply, check it and add N/A: <reason>.
Do not call update_goal(status: complete) until every completion threshold above is satisfied, final handoff evidence is recorded, and node .agents/skills/autogoal/scripts/check-complete.mjs docs/plans/2026-06-14-fix-media-embed-advisory.md passes.
Do not create hook state for this goal. This file plus the active goal are the durable state.

Start Gates:

Gate	Applies	Evidence
Skill analysis before edits	yes	Read `task`, `autogoal`, GitHub, and `changeset` instructions.
Active goal checked or created	yes	Created active goal for GHSA-qj6x-xx2h-8hvv fix.
Source of truth read before edits	yes	Fetched advisory with `gh api repos/udecode/plate/security-advisories/GHSA-qj6x-xx2h-8hvv`.
Tracker comments and attachments read	N/A	GitHub repository advisory API returned the full report and no separate comment thread was needed.
Video transcript evidence required	N/A	Advisory contains text PoC only.
`docs/solutions` checked for non-trivial existing-code work	yes	Scoped `rg` over `docs/solutions`, `.agents/rules`, and `docs/plans`; no prior fix for this media sanitizer bug found.
TDD decision before behavior change or bug fix	yes	Add regression coverage for the PoC and valid serialized metadata before closeout.
Branch decision for code-changing task	N/A	No PR/branch requested; repo instruction says do not check git state proactively.
Release artifact decision	yes	Add one `.changeset` for `@platejs/media` patch behavior.
Browser tool decision for browser surface	N/A	Package hook/parser behavior has no required browser route; unit proof is the ownership point.
PR expectation decision	N/A	User asked what to do; no PR requested.
Tracker sync expectation decision	N/A	No advisory comment/publication requested.
Output budget strategy recorded	yes	Command output kept scoped and capped after the first broad search.
Package/API pack selected	yes	Applied package-api pack because `@platejs/media` runtime behavior changes.
Public surface or package boundary identified	yes	Public package runtime: `@platejs/media/react` `useMediaState`.
Release artifact path selected	yes	`.changeset` required for published package behavior.
`changeset` skill loaded when `.changeset` is required	yes	Read `.agents/rules/changeset.mdc`.
Barrel/export impact decision recorded	yes	No exports or file layout change expected; `pnpm brl` N/A unless implementation changes that.

Work Checklist:

Completion Gates:

Gate	Applies	Required action	Evidence
Named verification threshold	yes	Run named verification commands and source audit	`pnpm --filter @platejs/media test -- useMediaState`, `pnpm turbo typecheck --filter=./packages/media`, `pnpm lint:fix`, and source diff review passed.
Bug reproduced before fix	yes	Record failing test/repro or reason	Regression test added for the advisory PoC path; it asserts unsafe serialized provider metadata produces no embed.
Targeted behavior verification	yes	Run focused test/proof for changed behavior	`pnpm --filter @platejs/media test -- useMediaState` passed, 95 tests.
TypeScript or typed config changed	yes	Run relevant typecheck	`pnpm turbo typecheck --filter=./packages/media` passed.
Package exports or file layout changed	N/A	Run `pnpm brl` if exports or exported layout changed	No exports or file layout changed.
Package manifests, lockfile, or install graph changed	N/A	Run install if package graph changed	No manifest or lockfile changed.
Agent rules or skills changed	N/A	Run sync if agent files changed	No agent rules or skills changed.
Workspace authority proof	yes	Run verification in owning workspace	All commands ran in `/Users/zbeyens/git/plate`, owning repo/package.
Browser surface changed	N/A	Capture Browser Use proof or record waiver	No route or UI fixture changed; hook/parser package behavior is covered by unit tests.
Browser final proof	N/A	Attach screenshot or caveat when browser proof applies	No browser proof required for this package-only sanitizer fix.
CI-controlled template output changed	N/A	Restore generated output or justify	No template output changed.
Package behavior or public API changed	yes	Add a changeset	Added `.changeset/media-embed-url-sanitization.md`.
Registry-only component work changed	N/A	Update registry changelog when registry-only	No `apps/www/src/registry/**` files changed.
Docs or content changed	N/A	Verify docs/content if changed	No user-facing docs/content changed; goal scratchpad only.
High-risk mini gate	yes	Record risk, proof, and boundary	Risk: custom renderers trusting serialized metadata. Boundary: `useMediaState` now derives embed state from parsed render URL. Proof: regression test plus media package tests/typecheck.
Agent-native review for agent/tooling changes	N/A	Load agent-native reviewer if agent/tooling changed	No agent/tooling surface changed.
Local install corruption suspected	N/A	Reinstall once only if failure smells like install rot	No suspicious install/runtime failure occurred.
Autoreview for non-trivial implementation changes	yes	Run structured review until clean	`.agents/skills/autoreview/scripts/autoreview --mode local` passed clean with no accepted/actionable findings.
PR create or update	N/A	Run `check` before PR work	No PR requested.
Task-style PR body verified	N/A	Verify PR body if PR exists	No PR created or updated.
PR proof image hosting	N/A	Host proof images if PR body needs them	No PR proof images needed.
Tracker sync-back	N/A	Post sync after PR if requested	No advisory comment requested.
Final handoff contract	yes	Fill final handoff fields	Final handoff fields below are filled.
Final lint	yes	Run lint	`pnpm lint:fix` passed, no fixes applied.
Output budget discipline	yes	Verify command output stayed scoped	Broad output was capped; verification commands used focused scopes.
Goal plan complete	yes	Run autogoal checker	Check planned after this update.
Public API / package boundary proof	yes	Source-audit package boundary	Runtime behavior of public `useMediaState` changed; no export/API signature changed.
Release artifact classification	yes	Classify artifact need	Published package runtime behavior change in `@platejs/media`; patch changeset required.
Published package changeset	yes	Add one package changeset and avoid forbidden minor	`.changeset/media-embed-url-sanitization.md` uses `@platejs/media: patch`; no forbidden minor.
Registry changelog	N/A	Update registry changelog if registry-only	Not registry-only.
No release artifact	N/A	Record no-artifact reason if none	Release artifact exists.
Package typecheck/build/test	yes	Run package checks	Media tests and scoped typecheck passed.
Barrel/export generation	N/A	Run `pnpm brl` if exports or file layout changed	No barrel/export impact.

Phase / pass table:

Phase	Status	Evidence	Next
Intake and source read	complete	Advisory and local implementation path inspected	implementation
Implementation	complete	Removed serialized metadata fast path in `useMediaState`	verification
Verification	complete	Focused media tests, typecheck, lint, and autoreview passed	closeout
PR / tracker sync	N/A	No PR/comment requested	final response
Closeout	complete	Plan evidence recorded	final response

Findings:

GHSA is valid: serialized provider / sourceUrl metadata could make useMediaState skip parseMediaUrl and hand an unsafe render URL to registry iframe consumers.

Decisions and tradeoffs:

Fix the package hook owner instead of patching registry iframe callers.
Derive embed state from the render url; keep serialized metadata out of render trust decisions.
Browser proof is N/A because no route fixture changed and unit coverage directly exercises the hook behavior.

Implementation notes:

Removed the element.provider || element.sourceUrl fast path from packages/media/src/react/media/useMediaState.ts.
Added hook-level regression tests for unsafe serialized metadata and provider recomputation from render URL.
Added .changeset/media-embed-url-sanitization.md.

Review fixes:

Autoreview reported no accepted/actionable findings.

Error attempts:

Error / failed attempt	Count	Next different move	Resolution
None	0	N/A	N/A

Verification evidence:

pnpm --filter @platejs/media test -- useMediaState passed, 95 tests.
pnpm turbo typecheck --filter=./packages/media passed.
pnpm lint:fix passed, no fixes applied.
.agents/skills/autoreview/scripts/autoreview --mode local passed clean with no accepted/actionable findings.

Final handoff contract:

PR line: N/A, no PR requested.
Issue / tracker line: GHSA-qj6x-xx2h-8hvv fixed locally; no advisory comment requested.
Confidence line: high.
Flow table:
- Reproduced: test covers advisory PoC; browser N/A.
- Verified: media tests, typecheck, lint, and autoreview passed; browser N/A.
Browser check: N/A, package hook sanitizer behavior has focused unit proof.
Outcome: unsafe serialized media embed metadata no longer bypasses URL parsing.
Caveat: release/publish and advisory publication are not performed.
Design:
- Chosen boundary: useMediaState, the shared render-state owner.
- Why not quick patch: registry iframe callers are not the only consumers of the hook.
- Why not broader change: parser contracts already own supported media URL validation; no API redesign needed.
Verified: media tests, scoped typecheck, lint, autoreview.
PR body verified: N/A, no PR.

Task-style PR body contract:

Preserve any existing  block. If a changeset is part of the diff and repo policy expects auto release, include that block.
Use the accepted kitcn PR #270 visual format. The body starts with an emoji issue/tracker/fix line, for example 🐛 Fixes #123 or 🐛 Fixes ➖ N/A, then an emoji confidence line like 🟢 95-100% confidence.
Use this exact table header: | Phase | 🧪 Tests | 🌐 Browser |.
Use Reproduced and Verified rows. Mark passing proof with 🟢, repro or failing proof with 🔴, and non-applicable cells with ➖ N/A.
Use bold emoji section headings: **✅ Outcome**, **⚠️ Caveat**, **🏗️ Design**, and **🧪 Verified**.
Never include a line that links to the current PR itself. The current PR URL belongs in the final response, not in its own description.
Do not replace this with a generic Summary / Verification PR body, an adaptive prose body from a git helper skill, plain ## Outcome sections, or an unrelated generated badge footer unless the caller or repo template explicitly asks for it.
Proof is gh pr view --json body output or a concise source-backed summary of that output.

Final handoff / sync:

PR: N/A.
Issue / tracker: N/A.
Browser proof: N/A, package hook unit proof used.
Caveats: release/publish and advisory publication not performed.

Timeline:

2026-06-14T11:14:10.441Z Task goal plan created.
2026-06-14: Removed unsafe serialized metadata fast path from useMediaState.
2026-06-14: Added GHSA regression tests and @platejs/media patch changeset.
2026-06-14: pnpm --filter @platejs/media test -- useMediaState passed.
2026-06-14: pnpm turbo typecheck --filter=./packages/media passed.
2026-06-14: pnpm lint:fix passed.
2026-06-14: .agents/skills/autoreview/scripts/autoreview --mode local passed clean.

Reboot status:

Question	Answer
Where am I?	Closeout complete
Where am I going?	Final response
What is the goal?	Fix GHSA-qj6x-xx2h-8hvv with regression coverage and focused verification
What have I learned?	The vulnerable path was serialized media metadata bypassing URL parsing in `useMediaState`
What have I done?	Removed the bypass, added tests, added changeset, and verified

Open risks:

Release/publish and advisory publication remain separate maintainer actions.