Skip to content
Fencer Vulns
critical 9.9

CVE-2025-20051 json

Arbitrary file read via block duplication in Mattermost Boards

published 2025-02-24 20 mo ago modified 2026-09-10 1 mo ago also GHSA-v469-7wp6-7cvp , GO-2025-3483 , EUVD-2025-4306

cvss
9.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.

Patch / fix

  • go github.com/mattermost/mattermost/server/v8 8.0.0-20250122165010-4ed702ccff4e, 9.11.8, 10.2.3, 10.3.3, 10.4.2
  • go github.com/mattermost/mattermost-server 9.11.8+incompatible, 10.2.3+incompatible, 10.3.3+incompatible, 10.4.2+incompatible
  • Mattermost Mattermost 9.11.8, 10.2.3, 10.3.3, 10.4.2, 10.5.0
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250312T181707-1.1

opensuse advisories openSUSE-SU-2025:14889-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
20 mo ago

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost/server/v8
<8.0.0-20250122165010-4ed702ccff4e
>=9.11.0-rc1, <9.11.8
>=10.2.0-rc1, <10.2.3
>=10.3.0-rc1, <10.3.3
>=10.4.0-rc1, <10.4.2
8.0.0-20250122165010-4ed702ccff4e
9.11.8
10.2.3
10.3.3
10.4.2
go github.com/mattermost/mattermost-server
>=9.11.0-rc1+incompatible, <9.11.8+incompatible
>=10.2.0-rc1+incompatible, <10.2.3+incompatible
>=10.3.0-rc1+incompatible, <10.3.3+incompatible
>=10.4.0-rc1+incompatible, <10.4.2+incompatible
9.11.8+incompatible
10.2.3+incompatible
10.3.3+incompatible
10.4.2+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-22 Improper Limitation of a Pathname to a Restricted Directory

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.