CVE-2026-10527

CVE CVE-2026-10527EUVD EUVD-2026-60192Published 2026-08-17T14:37:46.000ZLast changed 2026-08-17T15:25:25.000ZCVSS 6.3

What the advisory describes

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to reconcile SchemeAdmin flags with a user's current role which allows a user demoted to System Guest to retain Board Admin privileges and perform admin-only operations via the Boards REST API or UI.. Mattermost Advisory ID: MMSA-2026-00691

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Mattermost — Mattermost 11.8.0 ≤11.8.3; 11.7.0 ≤11.7.6; 10.11.0 ≤10.11.21

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Mattermost — Mattermost

Does this concern one of your customers?

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Try it for 28 days

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.