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Fencer Vulns
low 3.1

CVE-2025-13870 json

Unauthorized access and subscription vulnerability in Boards

published 2025-12-02 11 mo ago modified 2026-10-18 21 d ago also GHSA-58w6-w55x-6wq8 , GO-2025-4178 , EUVD-2025-200218

cvss
3.1
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 15%
public exploits
0
none known

Summary

Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to

Patch / fix

  • go github.com/mattermost/mattermost/server/v8 8.0.0-20250905150616-ba86dfc5876b, 8.0.0-20251212204551-54f2e9b4afd5
  • go github.com/mattermost/mattermost 10.5.13, 10.5.13+incompatible, 10.11.5, 10.11.5+incompatible
  • Mattermost Mattermost 10.5.13, 10.11.5, 11.1.0
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20251230T014957-150000.1.134.1
  • govulncheck-vulndb SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 0.0.20251209T172047-150000.1.127.1

suse advisories SUSE-SU-2026:0037-1SUSE-SU-2025:4395-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost/server/v8
<8.0.0-20250905150616-ba86dfc5876b
<8.0.0-20251212204551-54f2e9b4afd5
8.0.0-20250905150616-ba86dfc5876b
8.0.0-20251212204551-54f2e9b4afd5
go github.com/mattermost/mattermost
>=10.11.0, <10.11.5
>=10.5.0, <10.5.13
>=10.5.0+incompatible, <10.5.13+incompatible
>=10.11.0+incompatible, <10.11.5+incompatible
10.11.5
10.5.13
10.5.13+incompatible
10.11.5+incompatible
go github.com/mattermost/mattermost-server
all versions
 no fix listed
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-306 Missing Authentication for Critical Functionality
  • CWE-284 Improper Access Control

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.