CVE-2025-27715

lowpriority · track · 11OT risk · elevatedEPSS 0.002 · 12 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.22% (12th) EPSS

CVSS 2.7 · low

Is it mine?

18 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-28

Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.

cvss

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

3.3

010

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

v3.12.7lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 1.2 · impact 1.4

v3.13.3lowCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU

v3.13.3lowCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 0.7 · impact 2.5

v3.13.3lowCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:Nsecondary · OSV

v3.12.5lowCVSS:3.1/AV:N/AC:L/PR:H/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-863USprimaryCWE-863US

affected products (18)

Products and version ranges known to be affected.

Mattermost Mattermost <10.3.4all versionscert_bundDE
Mattermost Mattermost <10.4.3all versionscert_bundDE
Mattermost Mattermost <10.5.1all versionscert_bundDE
Mattermost Mattermost <10.6.0all versionscert_bundDE
Mattermost Mattermost <9.11.9all versionscert_bundDE
Mattermost Mattermost< 10.3.4cert_bundDE
Mattermost Mattermost< 10.4.3cert_bundDE
Mattermost Mattermost< 10.5.1cert_bundDE
Mattermost Mattermost< 10.6.0cert_bundDE
Mattermost Mattermost< 9.11.9cert_bundDE
Mattermost Mattermost≤ 9.11.0 ≤9.11.8enisa_euvdEU
mattermost mattermost server9.11.0 → 9.11.9nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Bitnami mattermost9.11.0 → 10.0.0osvUSpkg:bitnami/mattermost
Go github.com/mattermost/mattermost-server9.11.0+incompatible → 9.11.9+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/v89.11.0 → 9.11.9osvUSpkg:golang/github.com/mattermost/mattermost/server/v8

advisories (4)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-0410Mattermost: Mehrere SchwachstellenDeutsch2025-02-18csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mattermost ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Informationen offenzulegen, bestimmte Befehle auszuführen und die Verfügbarkeit zu beeinflussen.
GHSA-cw7q-5cgc-h3h9Mattermost fail to prompt for explicit approval before adding a team admin to a private channel2025-03-21ghsa · osvUS
Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.
BIT-mattermost-2025-277152025-03-28vendor · osvUS
Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.
GO-2025-3555Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server2025-03-25vendor · osvUS
Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server

also known as (6)

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 2025-03-21modified 2026-06-17

related (5,014)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-71362US	—OT critical	90.5% (100th)	KEV	2026-08-11
Adobe Commerce is affected by an Incorrect Authorization vulnerability that could result in privilege escalation. An attacker could leverage this vulnerability to gain elevated acc…
CVE-2026-42016US	high8.8OT critical	8.64% (95th)	KEV	2026-07-27
JFrog Artifactory (Self Hosted) versions before 7.133.11 are vulnerable to a privilege escalation attack due to a validation check of the token signature/issuer and not the token’s…
CVE-2025-55177US	—OT critical	13.1% (96th)	KEV	2025-08-29
Incomplete authorization of linked device synchronization messages in WhatsApp for iOS prior to v2.25.21.73, WhatsApp Business for iOS v2.25.21.78, and WhatsApp for Mac v2.25.21.78…
CVE-2025-54253US	—OT critical	88.8% (100th)	KEV	2025-08-05
Adobe Experience Manager versions 6.5.23 and earlier are affected by a Misconfiguration vulnerability that could result in arbitrary code execution. An attacker could leverage this…
CVE-2025-21479US	—OT critical	0.84% (58th)	KEV	2025-06-03
Memory corruption due to unauthorized command execution in GPU micronode while executing specific sequence of commands.

+5009 more

references (5)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan