CVE-2026-63097 Dendrite 0.13.8 syncapi /context Endpoint Post-Leave State Exposure

Dendrite through 0.13.8 contains an improper access control vulnerability in the syncapi /context endpoint syncapi/routing/context.go that allows authenticated local users to access post-leave room state events by exploiting a flawed membership check that evaluates only the RoomExists field while...

CVE-2026-63097

Dendrite 0.13.8 is affected by an improper access-control in the syncapi /context endpoint (syncapi/routing/context.go). The flaw uses a flawed membership check that only considers RoomExists, ignoring IsInRoom, HasBeenInRoom, and Membership fields, allowing authenticated local users who have lef...

PT-2026-60790

Dendrite through 0.13.8 contains an improper access control vulnerability in the syncapi /context endpoint syncapi/routing/context.go that allows authenticated local users to access post-leave room state events by exploiting a flawed membership check that evaluates only the RoomExists field while...