Team Privacy Settings Authorization Bypass in Mattermost Server

published 2025-05-29 17 mo ago modified 2026-06-17 4 mo ago also GHSA-4mmr-2w8p-whcr , GO-2025-3724 , EUVD-2025-16395

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits: 0; none known

Mattermost versions 10.7.x <= 10.7.0, 10.6.x <= 10.6.2, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fail to properly validate permissions when changing team privacy settings, allowing team administrators without the 'invite user' permission to access and modify team invite IDs via the /api/v4/teams/:teamId/privacy endpoint.

Patch / fix

fixed in 3 distros 1 links 1

go github.com/mattermost/mattermost/server/v8 8.0.0-20250412152950-02c76784380a, 9.11.13, 10.5.4, 10.6.3, 10.7.1
go github.com/mattermost/mattermost-server 9.11.13+incompatible, 10.5.4+incompatible, 10.6.3+incompatible, 10.7.1+incompatible
Mattermost Mattermost 9.11.13, 10.5.4, 10.6.3, 10.7.1, 10.8.0

govulncheck-vulndb openSUSE Tumbleweed 0.0.20250612T141001-1.1

opensuse advisories openSUSE-SU-2025:15225-1

github.com/mattermost/mattermost@02c7678 commit

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 17 mo ago (2025-05-29)

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	3.8	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/mattermost/mattermost/server/v8	>=10.7.0-rc1, <10.7.1 >=10.6.0-rc1, <10.6.3 >=10.5.0-rc1, <10.5.4 >=9.0.0-rc1, <9.11.13 <8.0.0-20250412152950-02c76784380a	10.7.1 10.6.3 10.5.4 9.11.13 8.0.0-20250412152950-02c76784380a
go	github.com/mattermost/mattermost-server	>=9.0.0-rc1+incompatible, <9.11.13+incompatible >=10.5.0-rc1+incompatible, <10.5.4+incompatible >=10.6.0-rc1+incompatible, <10.6.3+incompatible >=10.7.0-rc1+incompatible, <10.7.1+incompatible	9.11.13+incompatible 10.5.4+incompatible 10.6.3+incompatible 10.7.1+incompatible
go	github.com/mattermost/mattermost-server/v5	all versions	no fix listed
go	github.com/mattermost/mattermost-server/v6	all versions	no fix listed

Affected products

Mattermost Mattermost

Classification

Weakness

CWE-863 Incorrect Authorization

References

github.com /mattermost/mattermost/commit/02c76784380acb6802601bd24c205553b9a5a1be
web
mattermost.com /security-updates
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2025-3913
advisory
github.com /mattermost/mattermost
package
github.com /advisories/GHSA-4mmr-2w8p-whcr
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary