o2 Posting Access: Check 'edit_post' before an existing post is updated - #896
o2 Posting Access: Check 'edit_post' before an existing post is updated#896bor0 wants to merge 3 commits into
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The posting capabilities this plugin grants are primitive: they say nothing about which post they apply to. A write path that acts on a post ID without asking 'edit_post' about that particular ID therefore reads them as permission over any row in the table. Re-check it on the caller's behalf for users who cannot edit other people's posts, and short-circuit the write when the answer is no. Inserts, editors and administrators, and requests with no current user are untouched. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019QyDZA2WrPWNwcD4qXh5RT
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📝 WalkthroughWalkthroughThe plugin adds a write-path filter that blocks unauthorized updates to existing posts. Tests cover revisions, pages, attachments, post content, post-type capabilities, permitted edits, no-user updates, empty content, and ID-less inserts. ChangesPosting access restriction
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant wp_update_post
participant wp_insert_post_empty_content
participant current_user_can
wp_update_post->>wp_insert_post_empty_content: evaluate existing post update
wp_insert_post_empty_content->>current_user_can: check post type capability or edit_post
current_user_can-->>wp_insert_post_empty_content: capability result
wp_insert_post_empty_content-->>wp_update_post: preserve or return empty-content result
Suggested reviewers: Merge Risk: 🟠 High · up to Users with an edit-others capability may still modify private posts without the required status-specific permission, creating an authorization bypass that can affect post privacy and integrity. The object-specific capability check must be enforced before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In
`@wordpress.org/public_html/wp-content/plugins/wporg-o2-posting-access/wporg-o2-posting-access.php`:
- Line 318: Update the authorization condition in the posting-access flow to
remove the current_user_can( 'edit_others_posts' ) bypass and always enforce the
object-specific edit_post capability for the target post. Add a regression test
covering a role that has edit_others_posts but fails edit_post for that object,
ensuring the update is rejected.
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…t means. 'edit_others_posts' is only the generic name for that capability. A post type can name its own, and on Make sites some do, so exempting on the generic name let somebody past the object check on a type whose capability they were never given. Read the capability off the target post's own type, resolving a revision to its parent the way map_meta_cap() does, and fall back to the generic name only when the type cannot be resolved. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019QyDZA2WrPWNwcD4qXh5RT
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Inline comments:
In
`@wordpress.org/public_html/wp-content/plugins/wporg-o2-posting-access/wporg-o2-posting-access.php`:
- Line 334: Update the existing-post authorization logic around current_user_can
so every update always validates current_user_can( 'edit_post', $post_id )
instead of bypassing it when the edit_others capability is granted; preserve the
object-specific private-post checks and add a regression test covering
edit_others_posts without edit_private_posts.
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…pability name. Exempting on a capability name was coarser than 'edit_post' itself: whoever held the name skipped the status-dependent half of the object check, so somebody with 'edit_others_posts' and no 'edit_private_posts' could still be let through to another author's private post. Ask about the object every time instead. The one exemption left is structural rather than a judgement call. A post type that does not map meta capabilities answers 'edit_post' with a primitive no role is granted, so the question denies a site administrator too. Core's custom_css is registered that way and the Customizer saves Additional CSS through wp_update_post(), which the tests now pin. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019QyDZA2WrPWNwcD4qXh5RT
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The posting capabilities this plugin grants are primitive: they say nothing about which post they apply to. A write path that acts on a post ID without asking
edit_postabout that particular ID therefore reads them as permission over any row in the table, and the primitive capabilities a low-privileged role carries read the same way.wp_insert_post_empty_contentnow re-checksedit_postwhen an existing post is being updated, and short-circuits the write when the answer is no. It applies to users who cannot edit other people's posts. Inserts are untouched, since a row that does not exist yet has nobody to take it from, as are editors and administrators and requests with no current user (cron, WP-CLI, importers).The plugin's PHPUnit suite gains regression coverage for posts, pages, attachments and revisions belonging to somebody else, alongside the paths that have to keep working: editing your own submission, attaching your own upload to your own post, an editor editing anybody's post, and programmatic updates. 53 tests pass.
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