CVE-2026-3524

highpriority · track · 0OT risk · elevatedEPSS 0.004 · 32 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.38% (32nd) EPSS

CVSS 8.3 · high

Is it mine?

4 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-28

Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621

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

v3.18.3highCVSS: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

v3.18.1highCVSS: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-862US

affected products (4)

Products and version ranges known to be affected.

Mattermost Mattermost Plugins <1.1.5.0all versionscert_bundDE
Mattermost Mattermost≤ Plugins <1.1.5.0cert_bundDE
Mattermost Mattermost≤ 0 ≤1.1.4enisa_euvdEU
mattermost legal hold< 1.1.5nvdUScpe:2.3:a:mattermost:legal_hold:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0625Mattermost-Plugin "Legal Hold": Schwachstelle ermöglicht nicht spezifizierten AngriffDeutsch2026-03-05csaf · cert_bundDE
Ein Angreifer kann eine Schwachstelle im Mattermost-Plugin "Legal Hold" ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-04-06modified 2026-08-06

references (3)

External citations — patches, advisories, analysis.

scry

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