CVE-2025-9078

mediumpriority · track · 0EPSS 0.002 · 5 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.15% (5th) EPSS

CVSS 4.3 · medium

Is it mine?

40 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-26

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

cvss

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 2.8 · impact 1.4

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.14mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-328USCWE-328US

affected products (40)

Products and version ranges known to be affected.

Mattermost Mattermost Servr <10.10.2all versionscert_bundDE
Mattermost Mattermost Servr <10.11.0all versionscert_bundDE
Mattermost Mattermost Servr <10.5.10all versionscert_bundDE
Mattermost Mattermost Servr <10.5.9all versionscert_bundDE
Mattermost Mattermost Servr <10.8.4all versionscert_bundDE
Mattermost Mattermost Servr <10.9.4all versionscert_bundDE
Mattermost Mattermost Servr <10.9.5all versionscert_bundDE
Mattermost Mattermost Servr <9.11.18all versionscert_bundDE
Mattermost Mattermost≤ Servr <10.5.9cert_bundDE
Mattermost Mattermost≤ Servr <10.10.2cert_bundDE
Mattermost Mattermost≤ Servr <10.11.0cert_bundDE
Mattermost Mattermost≤ Servr <10.5.10cert_bundDE
Mattermost Mattermost≤ Servr <10.8.4cert_bundDE
Mattermost Mattermost≤ Servr <10.9.4cert_bundDE
Mattermost Mattermost≤ Servr <10.9.5cert_bundDE
Mattermost Mattermost≤ Servr <9.11.18cert_bundDE
Mattermost Mattermost≤ 9.11.0 ≤9.11.17enisa_euvdEU
Mattermost Mattermost≤ 10.8.0 ≤10.8.3enisa_euvdEU
Mattermost Mattermost≤ 10.10.0 ≤10.10.1enisa_euvdEU
Mattermost Mattermost≤ 10.5.0 ≤10.5.8enisa_euvdEU

showing 20 of 40

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1856Mattermost Server: Mehrere SchwachstellenDeutsch2025-08-17csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mattermost Server ausnutzen, um Informationen offenzulegen, Sicherheitsmaßnahmen zu umgehen oder Code auszuführen.
GHSA-9p92-x77w-9fw2Mattermost makes Use of Weak Hash2025-09-15ghsa · osvUS
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.
GO-2025-3959Mattermost makes Use of Weak Hash in github.com/mattermost/mattermost-server2025-09-17vendor · osvUS
Mattermost makes Use of Weak Hash in github.com/mattermost/mattermost-server

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund NVD CVE.org MITRE

published 2025-09-15modified 2026-10-19

references (4)

External citations — patches, advisories, analysis.

scry

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