Access Control Vulnerability in Mattermost by Mattermost

CVE-2026-2463

What is CVE-2026-2463?

Mattermost versions 11.3.x through 11.3.0, 11.2.x through 11.2.2, and 10.11.x through 10.11.10 exhibit a critical flaw in their access control mechanism. This vulnerability allows users to circumvent permissions by exploiting improperly filtered invite IDs, potentially enabling them to create unauthorized accounts when teams are established. As a result, sensitive team environments can be compromised, underscoring the importance of maintaining strict user permissions and access integrity in collaborative spaces.

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References