CVE-2026-8683

mediumpriority · track · 0EPSS 0.002 · 10 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.20% (10th) EPSS

CVSS 6.5 · medium

Is it mine?

9 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-28

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652

cvss

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

6.5

010

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

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

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

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-770US

affected products (9)

Products and version ranges known to be affected.

Mattermost Mattermost Desktop <5.13.6all versionscert_bundDE
Mattermost Mattermost Desktop <6.1.1all versionscert_bundDE
Mattermost Mattermost Desktop <6.2.0all versionscert_bundDE
Mattermost Mattermost≤ Desktop <6.1.1cert_bundDE
Mattermost Mattermost≤ Desktop <5.13.6cert_bundDE
Mattermost Mattermost≤ Desktop <6.2.0cert_bundDE
Mattermost Mattermost≤ 0 ≤5.5.13enisa_euvdEU
mattermost mattermost desktop≤ 5.13.0nvdUScpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*
mattermost mattermost desktop6.1.0 → 6.1.5nvdUScpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1565Mattermost Desktop: Mehrere Schwachstellen ermöglichen nicht spezifizierten AngriffDeutsch2026-05-17csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mattermost Desktop 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 2026-06-15modified 2026-06-17

references (3)

External citations — patches, advisories, analysis.

scry

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