What is CVE-2026-63095?

CVE-2026-63095 is a medium-severity vulnerability in Matrix-org Dendrite, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-07-17.

How severe is CVE-2026-63095?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Matrix-org Dendrite

CVE-2026-63095

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…

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Matrix-org Dendrite — versions 0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-63095?: CVE-2026-63095 is a medium-severity vulnerability in Matrix-org Dendrite, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-07-17.
How severe is CVE-2026-63095?: Medium severity. CVSS v3 base score is 6.5 out of 10.