CVE-2026-7387

highpriority · track · 0OT risk · elevatedEPSS 0.003 · 24 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.31% (24th) EPSS

CVSS 8.8 · high

Is it mine?

24 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests.. Mattermost Advisory ID: MMSA-2026-00665

cvss

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

8.8

010

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

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · responsibledisclosure@mattermost.comexploitability 2.8 · impact 5.9

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USCWE-863US

affected products (24)

Products and version ranges known to be affected.

Mattermost Mattermost Server <10.11.17all versionscert_bundDE
Mattermost Mattermost Server <11.5.5all versionscert_bundDE
Mattermost Mattermost Server <11.6.2all versionscert_bundDE
Mattermost Mattermost Server <11.7.0all versionscert_bundDE
Mattermost Mattermost≤ Server <10.11.17cert_bundDE
Mattermost Mattermost≤ Server <11.5.5cert_bundDE
Mattermost Mattermost≤ Server <11.6.2cert_bundDE
Mattermost Mattermost≤ Server <11.7.0cert_bundDE
Mattermost Mattermost≤ 11.5.0 ≤11.5.4enisa_euvdEU
Mattermost Mattermost≤ 10.11.0 ≤10.11.16enisa_euvdEU
Mattermost Mattermost≤ 10.11.0 ≤10.11.15enisa_euvdEU
Mattermost Mattermost≤ 11.6.0 ≤11.6.1enisa_euvdEU
mattermost mattermost server10.11.0 → 10.11.17nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.5.0 → 11.5.5nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.6.0 → 11.6.2nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermost-server10.11.0 → 10.11.17osvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server10.11.0+incompatible → 10.11.17+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server11.5.0 → 11.5.5osvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server11.5.0+incompatible → 11.5.5+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server11.6.0 → 11.6.1osvUSpkg:golang/github.com/mattermost/mattermost-server

showing 20 of 24

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1529Mattermost Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten AngriffDeutsch2026-05-14csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Mattermost Server ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.
GHSA-6hxm-w4hv-vgvwMattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints2026-06-12ghsa · osvUS
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests. Mattermost Advisory ID: MMSA-2026-00665
GO-2026-6280Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints in github.com/mattermost/mattermost-server2026-08-25vendor · osvUS
Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints 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 NVD CVE.org MITRE

published 2026-06-12modified 2026-06-18

references (3)

External citations — patches, advisories, analysis.

scry

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