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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 prevent disclosure of created user password which allows a malicious attacker to impersonate a user via the use of some of those passwords.. Mattermost Advisory ID: MMSA-2026-00614

PUBLISHED Reserved 2026-04-15 | Published 2026-05-18 | Updated 2026-05-18 | Assigner Mattermost




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Problem types

CWE-522: Insufficiently Protected Credentials

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

eeshan finder

References

mattermost.com/security-updates (MMSA-2026-00614) vendor-advisory

cve.org (CVE-2026-6345)

nvd.nist.gov (CVE-2026-6345)

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