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Description

Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing

PUBLISHED Reserved 2025-08-15 | Published 2025-09-15 | Updated 2025-09-15 | Assigner Mattermost




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

Problem types

CWE-328: Use of Weak Hash

Product status

Default status
unaffected

10.8.0 (semver)
affected

10.5.0 (semver)
affected

9.11.0 (semver)
affected

10.10.0 (semver)
affected

10.9.0 (semver)
affected

10.11.0
unaffected

10.8.4
unaffected

10.5.9
unaffected

9.11.18
unaffected

10.10.2
unaffected

10.9.4
unaffected

Credits

daw10 finder

References

mattermost.com/security-updates

cve.org (CVE-2025-9078)

nvd.nist.gov (CVE-2025-9078)

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