CVE-2026-3117

Q: How severe is CVE-2026-3117?

CVE-2026-3117 has a CVSS score of 6.5/10, rated as Medium. Review the affected products list and apply vendor patches.

Q: What does the CVSS score mean for CVE-2026-3117?

CVSS (Common Vulnerability Scoring System) rates vulnerability severity from 0.0 to 10.0. CVE-2026-3117 scores 6.5/10 (Medium). Scores 9.0–10.0 are Critical, 7.0–8.9 are High, 4.0–6.9 are Medium, and below 4.0 are Low.

Q: Which devices are affected by CVE-2026-3117?

The list of devices confirmed to be affected by CVE-2026-3117 is shown in the "Affected Devices" section above. Check your firmware version against the vendor security advisory and apply the latest patch.

Q: How do I fix or mitigate CVE-2026-3117?

Apply the latest firmware or software update from the vendor. Check the References section above for official advisories and patch notes. If no patch is available, consider disabling the affected feature or isolating the device from untrusted networks.

Medium

6.5

0.05.010.0

Year

2026

Published

May 18, 2026

Known Affected Devices

CVSS Score

6.5

What is CVE-2026-3117?

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to properly check for permissions when processing commands in the Gitlab plugin which allows normal users to uninstall instances or setup webhook connections via the {{gitlab instance {option}}} or the {{/gitlab webhook {option}}} commands. Mattermost Advisory ID: MMSA-2026-00600

CVSS Vector Breakdown

CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Exploitable remotely over the network without requiring access to the local system.

Attack Complexity

Low

No special conditions required. Exploit can be performed reliably and repeatedly.

Privileges Required

Low

Basic user account required (e.g. standard login without admin rights).

User Interaction

None

No user interaction required. Exploit runs without any victim action.

Scope

Unchanged

Exploiting the vulnerability only affects the vulnerable component itself.

Confidentiality Impact

None

No confidentiality impact. Sensitive data is not exposed.

Integrity Impact

None

No integrity impact. Data cannot be modified.

Availability Impact

High

Complete denial of service. The component becomes fully unavailable.

FAQ

How severe is CVE-2026-3117?

CVE-2026-3117 has a CVSS score of 6.5/10, rated as Medium. Review the affected products list and apply vendor patches.

What does the CVSS score mean for CVE-2026-3117?

CVSS (Common Vulnerability Scoring System) rates vulnerability severity from 0.0 to 10.0. CVE-2026-3117 scores 6.5/10 (Medium). Scores 9.0–10.0 are Critical, 7.0–8.9 are High, 4.0–6.9 are Medium, and below 4.0 are Low.

Which devices are affected by CVE-2026-3117?

The list of devices confirmed to be affected by CVE-2026-3117 is shown in the "Affected Devices" section above. Check your firmware version against the vendor security advisory and apply the latest patch.

How do I fix or mitigate CVE-2026-3117?

Apply the latest firmware or software update from the vendor. Check the References section above for official advisories and patch notes. If no patch is available, consider disabling the affected feature or isolating the device from untrusted networks.