Is CVE-2026-6541 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-6541 being exploited in the wild.

How severe is CVE-2026-6541?

Medium severity, with a CVSS score of 4.3, published 13 July 2026.

Which products and versions are affected?

Mattermost 11.7.0 - 11.7.1, 11.6.0 - 11.6.4, 10.11.0 - 10.11.19.

Is there a fix for CVE-2026-6541?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-6541 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-6541?

Check whether you run Mattermost at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-6541: Mattermost authorization bypass in Playbook metric configuration

CVE-2026-6541 · Severity: medium · CVSS 4.3 · Published 2026-07-13

Mattermost, a collaboration platform for incident response and team communication, contains a security flaw in its Playbooks feature. An authorized user on a team can modify the metric settings of playbooks belonging to other users by sending a specially crafted request. While this does not allow for data theft, it could lead to unauthorized changes in how team performance and incident metrics are tracked and reported.

Technologies: Mattermost. Vendors: Mattermost.

Quick answers

Is CVE-2026-6541 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-6541 being exploited in the wild.
How severe is CVE-2026-6541?: Medium severity, with a CVSS score of 4.3, published 13 July 2026.
Which products and versions are affected?: Mattermost 11.7.0 - 11.7.1, 11.6.0 - 11.6.4, 10.11.0 - 10.11.19.
Is there a fix for CVE-2026-6541?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-6541 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-6541?: Check whether you run Mattermost at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An authorization bypass (CWE-639) exists in Mattermost Playbooks due to insufficient validation of metric IDs during import or update operations. An authenticated attacker with team access can supply a 'foreign' metric ID in a crafted request to modify the metric configuration of a playbook they do not own. The vulnerability is reachable over the network and requires low privileges (authenticated user). The impact is limited to integrity, specifically the unauthorized modification of playbook metric settings. The issue is addressed in versions 11.8.0, 11.7.2, 11.6.5, and 10.11.20.

Affected products

Mattermost Mattermost 11.7.0 - 11.7.1, 11.6.0 - 11.6.4, 10.11.0 - 10.11.19

Timeline

2026-07-13: advisory
2026-07-13: disclosed

References

https://mattermost.com/security-updates

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