CVE-2026-6343

Q: How severe is CVE-2026-6343?

CVE-2026-6343 has a CVSS score of 4.3/10, rated as Medium. Review the affected products list and apply vendor patches.

Q: What does the CVSS score mean for CVE-2026-6343?

CVSS (Common Vulnerability Scoring System) rates vulnerability severity from 0.0 to 10.0. CVE-2026-6343 scores 4.3/10 (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-2026-6343?

The list of devices confirmed to be affected by CVE-2026-6343 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-2026-6343?

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

4.3

0.05.010.0

Year

2026

Published

May 18, 2026

Known Affected Devices

CVSS Score

4.3

What is CVE-2026-6343?

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591

CVSS Vector Breakdown

CVSS 3.1

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

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

Low

Some sensitive information is disclosed, but attacker has limited access.

Integrity Impact

None

No integrity impact. Data cannot be modified.

Availability Impact

None

No availability impact. Service remains fully operational.

FAQ

How severe is CVE-2026-6343?

CVE-2026-6343 has a CVSS score of 4.3/10, rated as Medium. Review the affected products list and apply vendor patches.

What does the CVSS score mean for CVE-2026-6343?

CVSS (Common Vulnerability Scoring System) rates vulnerability severity from 0.0 to 10.0. CVE-2026-6343 scores 4.3/10 (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-2026-6343?

The list of devices confirmed to be affected by CVE-2026-6343 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-2026-6343?

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.