WPGraphQL: Contributor can publish and modify posts without the required capabilities via updatePost

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

WPGraphQL provides a GraphQL API for WordPress sites. Prior to 2.22.2, the updatePost mutation in src/Mutation/PostObjectUpdate.php checks only the collection-level edit_posts capability and the post author, but does not enforce the object-level edit_post capability or require publish_posts for public status transitions. An authenticated Contributor can therefore publish the Contributor's own draft without editorial approval or modify the Contributor's previously published post despite lacking edit_published_posts, while posts owned by other authors remain protected. This issue is fixed in version 2.22.2.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Packages ]Affected open-source packages

• wp-graphql/wp-graphql composerAffected < 2.22.2 · GHSA-5mmc-8pc9-wggg

[ References ]References

• github.com/wp-graphql/wp-graphql/commit/55441663eaa33c3f2e05de038c8286c845916461
• github.com/wp-graphql/wp-graphql/pull/4270
• github.com/wp-graphql/wp-graphql/releases/tag/wp-graphql%2Fv2.22.2
• github.com/wp-graphql/wp-graphql/security/advisories/GHSA-5mmc-8pc9-wggg