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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-6345

27
FAUCET Score

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

First published: May 18, 2026Last modified: May 18, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 10.11.0, < 10.11.14CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
>= 11.4.0, < 11.4.4CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
>= 11.5.0, < 11.5.2CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
>= 10.11.0, <= 10.11.13CPE match
cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*
>= 11.4.0, <= 11.4.3CPE match
cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.23%
Probability of exploitation in next 30 days
EPSS Percentile
14.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0023 is in the 5th percentile among its peer group of 3,565 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

gopatch availablevia ghsa
Product: github.com/mattermost/mattermost/server/v8Fixed in: 11.5.2
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost/server/v8Fixed in: 10.11.14
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost/server/v8Fixed in: 11.4.4
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost/server/v8Fixed in: 8.0.0-20260311102650-3057ae7e83e9
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 5.3.2-0.20260311102650-3057ae7e83e9

Vendor Advisories (1)

goGHSA-wvgv-4fc3-2rcpmedium

Mattermost doesn't prevent disclosure of created user password

May 18, 2026

References

mattermost.com / security-updates
Vendor Advisory