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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-6346

34
FAUCET Score

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields before including them in support packet generation, which allows a Mattermost System Admin or any party with access to a support packet to obtain sensitive credentials in plaintext via downloading a support packet from the System Console.. Mattermost Advisory ID: MMSA-2026-00607

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

8.7HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.30%
Probability of exploitation in next 30 days
EPSS Percentile
22.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0030 is in the 3rd percentile among its peer group of 5,531 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.3 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: 8.0.0-20260326202606-fac92f4a71f3
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 5.3.2-0.20260326202606-fac92f4a71f3

Vendor Advisories (1)

goGHSA-9p64-jpc7-m2rphigh

Mattermost doesn't sanitize sensitive configuration fields before including them in support packet generation

May 18, 2026

References

mattermost.com / security-updates
Vendor Advisory