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Fencer Vulns
medium 5.4

CVE-2025-46702 json

Mattermost Playbooks allows privilege escalation through improper access control in playbook run participant management

published 2025-06-30 16 mo ago modified 2026-06-17 4 mo ago also GHSA-v8fr-vxmw-6mf6 , GO-2025-3796 , EUVD-2025-19559

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly enforce channel member management permissions when adding participants to playbook runs. This allows authenticated users with member-level permissions to bypass system admin restrictions and add or remove users to/from private channels via the playbook run participants feature, even when the 'Manage Members' permission has been explicitly removed. This can lead to unauthorized access to sensitive channel content and allow guest users to gain channel management privileges.

Patch / fix

  • go github.com/mattermost/mattermost-server 0.0.0-20250513065225-4ae5d647fb88, 9.11.16+incompatible, 10.5.6+incompatible, 10.6.6+incompatible, 10.7.3+incompatible, 10.8.1+incompatible
  • go github.com/mattermost/mattermost/server/v8 8.0.0-20250513065225-4ae5d647fb88, 9.11.16, 10.5.6, 10.6.6, 10.7.3, 10.8.1
  • Mattermost Mattermost 9.11.16, 10.5.6, 10.6.6, 10.7.3, 10.8.1, 10.9.0
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250730T213748-1.1

opensuse advisories openSUSE-SU-2025:15405-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
16 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost-server
<0.0.0-20250513065225-4ae5d647fb88
>=9.11.0+incompatible, <9.11.16+incompatible
>=10.5.0+incompatible, <10.5.6+incompatible
>=10.6.0+incompatible, <10.6.6+incompatible
>=10.7.0+incompatible, <10.7.3+incompatible
>=10.8.0+incompatible, <10.8.1+incompatible
0.0.0-20250513065225-4ae5d647fb88
9.11.16+incompatible
10.5.6+incompatible
10.6.6+incompatible
10.7.3+incompatible
10.8.1+incompatible
go github.com/mattermost/mattermost/server/v8
<8.0.0-20250513065225-4ae5d647fb88
>=9.11.0, <9.11.16
>=10.5.0, <10.5.6
>=10.6.0, <10.6.6
>=10.7.0, <10.7.3
>=10.8.0, <10.8.1
8.0.0-20250513065225-4ae5d647fb88
9.11.16
10.5.6
10.6.6
10.7.3
10.8.1
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

References

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.