MEDIUM 5.0 NVD

CVE-2026-18223

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate the invited recipient's email address when redeemi

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate the invited recipient's email address when redeeming team and guest invitation tokens, which allows an authenticated attacker to join a team or gain unauthorized access to private channels via a forwarded or leaked invitation link.. Mattermost Advisory ID: MMSA-2026-00747

References

https://mattermost.com/security-updates

Published: 2026-10-16 · Source: NVD · Feed updated: 2026-10-16

This medium severity vulnerability with a CVSS score of 5.0 was published on 2026-10-16 via NVD.

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