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CVE-20XX-?

CVE-2026-6345

6.5 MEDIUM 0.2% exploit odds Fix listed Auth & access Server

What it is

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail prevent disclosure of created user password which allows a malicious attacker to impersonate a user via the use of some of those passwords.. Mattermost Advisory ID: MMSA-2026-00614

At a glance

Exploitability: Can be exploited over the network with an admin-level account. High risk of data exposure, data tampering.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-05-18 09:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-14 20:10 UTC Last updatedMost recent change to the record

Details

Published: 2026-05-18 09:16 UTC
Last modified: 2026-10-14 20:10 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Weakness: CWE-522
Record status: Analyzed

Affected

Mattermost Server < 10.11.14
Mattermost Server < 11.4.4
Mattermost Server < 11.5.2

Attack profile CVSS 3.1 · 6.5

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Raw vector

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

Meme: I wake up, CVE-2026-6345

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Fix and advisories

https://mattermost.com/security-updates

References

https://mattermost.com/security-updates

NVD record · CVE.org record