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CVE-2026-63097: dendrite 0 through 0.13.8
CVE-2026-63097. CVSS 3.1 base score 4.3 (MEDIUM, Vendor/CNA). EPSS 0.00267 (percentile 0.17872), scored 24-Oct-2026.
Affected technology
dendrite · 0 through 0.13.8
matrix-org
Description’s affected range: through 0.13.8
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · Low privileges required · No user interaction required
What an attacker can do
Authenticated local users can access post-leave room state events by exploiting a flawed membership check that evaluates only the RoomExists field while ignoring IsInRoom, HasBeenInRoom, and Membership fields. Vendor/CNA’s CVSS 4.0 assessment (base score 5.3/10) rates confidentiality impact as low; integrity and availability impact as none.
- CWE
- CWE-863
- CCR priority
- 17.3 /100 (P5)
- CVSS 3.1
- 4.3 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N · Vendor/CNA
- EPSS
- 0.00267 · percentile 0.17872 · 2026-10-24
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-25 01:28:19.133527+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-63097.html