CVE-2025-14822

mediumpriority · track · 26EPSS 0.003 · 28 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.35% (28th) EPSS

CVSS 6.5 · medium

Is it mine?

23 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens

cvss

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

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.1–6.5

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.16.5mediumAV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.13.1lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.13.1lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:Lsecondary · responsibledisclosure@mattermost.comexploitability 1.6 · impact 1.4

v3.13.1lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:Lsecondary · OSV

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/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-770USprimaryCWE-407USCWE-407USCWE-407USCWE-770USCWE-770US

affected products (23)

Products and version ranges known to be affected.

Mattermost Mattermost Server <10.11.7all versionscert_bundDE
Mattermost Mattermost Server <10.11.9all versionscert_bundDE
Mattermost Mattermost Server <10.12.3all versionscert_bundDE
Mattermost Mattermost Server <11.0.5all versionscert_bundDE
Mattermost Mattermost Server <11.0.7all versionscert_bundDE
Mattermost Mattermost Server <11.1.0all versionscert_bundDE
Mattermost Mattermost Server <11.1.2all versionscert_bundDE
Mattermost Mattermost Server <11.2.0all versionscert_bundDE
Mattermost Mattermost≤ Server <11.0.5cert_bundDE
Mattermost Mattermost≤ Server <10.11.7cert_bundDE
Mattermost Mattermost≤ Server <10.11.9cert_bundDE
Mattermost Mattermost≤ Server <10.12.3cert_bundDE
Mattermost Mattermost≤ Server <11.0.7cert_bundDE
Mattermost Mattermost≤ Server <11.1.0cert_bundDE
Mattermost Mattermost≤ Server <11.1.2cert_bundDE
Mattermost Mattermost≤ Server <11.2.0cert_bundDE
Mattermost Mattermost≤ 10.11.0 ≤10.11.8enisa_euvdEU
Mattermost Inc Mattermost10.11.0 → 10.11.9fstec_bduRU
mattermost mattermost server10.11.0 → 10.11.9nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermost-server10.11.0 → 10.11.9osvUSpkg:golang/github.com/mattermost/mattermost-server

showing 20 of 23

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2880Mattermost Server und Desktop: Mehrere SchwachstellenDeutsch2025-12-17csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mattermost Server und Desktop ausnutzen, um Informationen offenzulegen, Sicherheitsmechanismen zu umgehen und um einen Denial of Service Zustand herbeizuführen.
GHSA-9r42-rhw3-2222Mattermost is vulnerable to CPU exhaustion via crafted HTTP request2026-01-16ghsa · osvUS
Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens.
GO-2026-4325Mattermost is vulnerable to CPU exhaustion via crafted HTTP request in github.com/mattermost/mattermost-server2026-02-26vendor · osvUS
Mattermost is vulnerable to CPU exhaustion via crafted HTTP request in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: .

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv cert_bund nvd NVD CVE.org MITRE

published 2026-01-16modified 2026-06-17

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+3263 more

references (4)

External citations — patches, advisories, analysis.

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