MEDIUM 4.3 NVD

CVE-2026-13417

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 the type of `fields.properties` on block creation

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 the type of `fields.properties` on block creation which allows an authenticated user with editor access to a board to crash the Boards plugin worker and trigger a denial of service via a child block whose `fields.properties` is a non-object value. Mattermost Advisory ID: MMSA-2026-00710

References

https://mattermost.com/security-updates

Published: 2026-09-14 · Source: NVD · Feed updated: 2026-09-15

This medium severity vulnerability with a CVSS score of 4.3 was published on 2026-09-14 via NVD.

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