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Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to limit the size of the request body on the start meeting API endpoint, which allows an authenticated attacker to cause resource exhaustion or denial of service via a crafted oversized HTTP POST request to {{/api/v1/meetings}}.. Mattermost Advisory ID: MMSA-2026-00608

PUBLISHED Reserved 2026-02-11 | Published 2026-05-18 | Updated 2026-05-18 | Assigner Mattermost




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

11.5.0 (semver)
affected

10.11.0 (semver)
affected

11.4.0 (semver)
affected

11.6.0
unaffected

11.5.2
unaffected

10.11.14
unaffected

11.4.4
unaffected

Credits

Lorenzo Gallegos finder

References

mattermost.com/security-updates (MMSA-2026-00608) vendor-advisory

cve.org (CVE-2026-2325)

nvd.nist.gov (CVE-2026-2325)

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