CVE-2025-35965

highpriority · track · 30EPSS 0.004 · 34 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.40% (34th) EPSS

CVSS 7.5 · high

Is it mine?

20 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions triggered by specific posts, overloading the server and leading to a denial-of-service (DoS) condition.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · responsibledisclosure@mattermost.comexploitability 2.8 · impact 3.6

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/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-770USCWE-770US

affected products (20)

Products and version ranges known to be affected.

Mattermost Mattermost≤ 10.4.0 ≤10.4.2enisa_euvdEU
Mattermost Mattermost≤ 10.5.0enisa_euvdEU
Mattermost Mattermostall versionsenisa_euvdEU
Mattermost Mattermost≤ 9.11.0 ≤9.11.10enisa_euvdEU
mattermost mattermost server10.4.0 → 10.4.3nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server= 10.5.0nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server9.11.0 → 9.11.11nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermost-plugin-playbooksall versionsosvUSpkg:golang/github.com/mattermost/mattermost-plugin-playbooks
Go github.com/mattermost/mattermost-plugin-playbooks< 1.41.0osvUSpkg:golang/github.com/mattermost/mattermost-plugin-playbooks
Go github.com/mattermost/mattermost-plugin-playbooks≥ 2.0.0osvUSpkg:golang/github.com/mattermost/mattermost-plugin-playbooks
Go github.com/mattermost/mattermost-server≥ 10.4.0+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server≥ 10.5.0+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server≥ 9.11.0+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server/v5all versionsosvUSpkg:golang/github.com/mattermost/mattermost-server/v5
Go github.com/mattermost/mattermost-server/v6all versionsosvUSpkg:golang/github.com/mattermost/mattermost-server/v6
Go github.com/mattermost/mattermost/server/v8all versionsosvUSpkg:golang/github.com/mattermost/mattermost/server/v8
Go github.com/mattermost/mattermost/server/v8< 8.0.0-20250218121836-2b5275d87136osvUSpkg:golang/github.com/mattermost/mattermost/server/v8
Go github.com/mattermost/mattermost/server/v8≥ 10.4.0osvUSpkg:golang/github.com/mattermost/mattermost/server/v8
Go github.com/mattermost/mattermost/server/v8≥ 10.5.0osvUSpkg:golang/github.com/mattermost/mattermost/server/v8
Go github.com/mattermost/mattermost/server/v8≥ 9.11.0osvUSpkg:golang/github.com/mattermost/mattermost/server/v8

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-689c-xq7x-xjwfMattermost Playbooks fails to validate the uniqueness and quantity of task actions2025-04-24ghsa · osvUS
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions triggered by specific posts, overloading the server and leading to a denial-of-service (DoS) condition.
GO-2025-3643Mattermost Playbooks fails to validate the uniqueness and quantity of task actions in github.com/mattermost/mattermost-plugin-playbooks2025-04-24vendor · osvUS
Mattermost Playbooks fails to validate the uniqueness and quantity of task actions in github.com/mattermost/mattermost-plugin-playbooks. 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 (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2025-04-24modified 2026-06-17

references (3)

External citations — patches, advisories, analysis.

scry

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