CVE-2026-18560

MediumCVSS 4.3/10Last modified Oct 29, 2026

Description

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate user’s permissions before other validations which allows non-content reviewers to infer a post’s flagged status via direct API call.. Mattermost Advisory ID: MMSA-2026-00754

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-203

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	>= 11.10.0, <= 11.10.0; >= 11.7.0, <= 11.7.9; >= 11.9.0, <= 11.9.1; >= 11.8.0, <= 11.8.5

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Oct 16, 2026
Last modified: Oct 29, 2026
NVD status: Analyzed

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