3.5

CVE-2026-9693

EPSS 0.16%
Veröffentlicht 17.08.2026 22:07:12
Zuletzt bearbeitet 19.08.2026 13:14:34
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Mattermost thread memberships persist after team removal, exposing private channel thread metadata on re-invite

Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via the team threads API.. Mattermost Advisory ID: MMSA-2026-00682

Betroffene Produkte Warnungen 0 Metriken 2 CWE 1 Referenzen 4

NVD 2 VulnDex Vulnerability Enrichment 1

Daten sind bereitgestellt durch National Vulnerability Database (NVD)

Mattermost ≫ Mattermost Server Version >= 10.11.0 < 10.11.21

Mattermost ≫ Mattermost Server Version >= 11.7.0 < 11.7.6

VulnDex Vulnerability Enrichment

Diese Information steht angemeldeten Benutzern zur Verfügung.

Zu dieser CVE wurde keine Warnung gefunden.

EPSS Metriken
Typ	Quelle	Score	Percentile
EPSS	FIRST.org	0.16%	0.056

CVSS Metriken
Quelle	Base Score	Exploit Score	Impact Score	Vector String
responsibledisclosure@mattermost.com	3.5	2.1	1.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

CWE-459 Incomplete Cleanup

The product does not properly "clean up" and remove temporary or supporting resources after they have been used.

https://mattermost.com/security-updates

Vendor Advisory

https://nvd.nist.gov/vuln/detail/CVE-2026-9693

CVE Source (NVD)

https://cveawg.mitre.org/api/cve/CVE-2026-9693

CVE Source (JSON)

https://euvd.enisa.europa.eu/vulnerability/CVE-2026-9693

EUVD