6.5

CVE-2026-5163

EPSS 0.21%
Veröffentlicht 18.05.2026 08:11:13
Zuletzt bearbeitet 18.05.2026 19:12:19
Quelle responsibledisclosure@mattermo
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Missing authorization check in AI message rewrite endpoint allows access to private thread content

Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not have access to via a crafted request to the post rewrite endpoint.. Mattermost Advisory ID: MMSA-2026-00645

Betroffene Produkte Warnungen 0 Metriken 2 CWE 1 Referenzen 4

NVD 1 VulnDex Vulnerability Enrichment 1

Daten sind bereitgestellt durch National Vulnerability Database (NVD)

Mattermost ≫ Mattermost Server Version >= 11.5.0 < 11.5.2

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	0.21%	0.104

CVSS Metriken
Quelle	Base Score	Exploit Score	Impact Score	Vector String
responsibledisclosure@mattermost.com	6.5	2.8	3.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CWE-862 Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

https://mattermost.com/security-updates

Vendor Advisory

https://nvd.nist.gov/vuln/detail/CVE-2026-5163

CVE Source (NVD)

https://cveawg.mitre.org/api/cve/CVE-2026-5163

CVE Source (JSON)

https://euvd.enisa.europa.eu/vulnerability/CVE-2026-5163

EUVD