CVE-2026-63095: matrix-org dendrite

Vulnerability summary

CVE-2026-63095 is a high (CVSS 7.1) vulnerability in matrix-org dendrite. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 20.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 17-07-2026
   PublishedVulnerability first disclosed.
2. 28-07-2026
   Last modifiedVulnerability information updated.

Description

Dendrite through 0.13.8 contains an improper authorization vulnerability in the Matrix Client-Server API that allows any authenticated local user to delete third-party identifier bindings belonging to other users by submitting an arbitrary address and medium to the account deletion endpoint without ownership verification. Attackers can exploit the unverified Forget3PID handler to remove a victim's email or MSISDN binding and subsequently rebind the address through an identity server to hijack the victim's password reset flow.

• CWE-639Authorization Bypass Through User-Controlled KeyThe system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.