CVE-2026-4286

mediumpriority · track · 17OT risk · elevatedEPSS 0.001 · 4 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.14% (4th) EPSS

CVSS 4.3 · medium

Is it mine?

12 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to check if {{team_id}} was being changed when updating playbooks, allowing users with only {{Manage Playbook Configurations}} permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID: MMSA-2025-00552

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⚠ sources disagree · low–medium · 3.1–4.3

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 1.4

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

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

v3.14mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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-863USCWE-863US

affected products (12)

Products and version ranges known to be affected.

Mattermost Mattermost≤ 10.11.0 ≤10.11.13enisa_euvdEU
Mattermost Mattermost≤ 11.5.0 ≤11.5.1enisa_euvdEU
mattermost mattermost server10.11.0 → 10.11.14nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.5.0 → 11.5.2nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermost-plugin-playbooks< 1.41.1-0.20260213020129-e1d6ec2c94e6osvUSpkg:golang/github.com/mattermost/mattermost-plugin-playbooks
Go github.com/mattermost/mattermost-server10.11.0+incompatible → 10.11.14+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server11.5.0+incompatible → 11.5.2+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/v810.11.0 → 10.11.14osvUSpkg:golang/github.com/mattermost/mattermost/server/v8
Go github.com/mattermost/mattermost/server/v811.5.0 → 11.5.2osvUSpkg:golang/github.com/mattermost/mattermost/server/v8

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-gvg4-jhmr-6j23Mattermost doesn't check if {{team_id}} was being changed when updating playbooks2026-05-18ghsa · osvUS
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to check if {{team_id}} was being changed when updating playbooks, allowing users with only {{Manage Playbook Configurations}} permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID: MMSA-2025-00552
GO-2026-5404Mattermost doesn't check if {{team_id}} was being changed when updating playbooks in github.com/mattermost/mattermost-plugin-playbooks2026-06-25vendor · osvUS
Mattermost doesn't check if {{team_id}} was being changed when updating playbooks in github.com/mattermost/mattermost-plugin-playbooks

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 2026-05-18modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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