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CVE-2026-2458

MediumCVSS 4.3/10Last modified Jun 17, 2026

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate team membership when searching channels which allows a removed team member to enumerate all public channels within a private team via the channel search API endpoint.. Mattermost Advisory ID: MMSA-2025-00568

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

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	>= 11.3.0, <= 11.3.0; >= 11.2.0, <= 11.2.2; >= 10.11.0, <= 10.11.10

References

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

Timeline

Published: Mar 16, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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CVE-2026-2458: Medium severity, CVSS 4.3 | Vulnix