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CVE-2026-6541 is an authorization flaw in Mattermost affecting versions 11.7.x through 11.7.1, 11.6.x through 11.6.4, and 10.11.x through 10.11.19. The issue arises because Mattermost does not properly restrict metric configuration changes to the playbook currently being saved. By submitting a crafted import or update request containing a metric identifier associated with a different playbook, an authenticated user with team access can alter another user's playbook metric settings. The vulnerability is a server-side access control failure that permits modification of resources outside the intended authorization scope.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.