NULL Pointer Dereference Affecting mattermost-10.11-compat package, versions <10.11.23-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-MATTERMOST1011COMPAT-20654757
- published9 Oct 2026
- disclosed14 Sept 2026
Introduced: 14 Sep 2026
CVE-2026-10556 (opens in a new tab)How to fix?
Upgrade Minimos:latest mattermost-10.11-compat to version 10.11.23-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mattermost-10.11-compat package and not the mattermost-10.11-compat package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate null entries in Microsoft Graph webhook notification payloads, which allows an unauthenticated attacker to crash the Microsoft Calendar plugin process and deny calendar integration service to all users on the instance via a crafted {{POST}} request to the public webhook endpoint.. Mattermost Advisory ID: MMSA-2026-00693