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Fencer Intel
critical 9.9

CVE-2025-4981 json

Path Traversal Leading to RCE by Any Authenticated Mattermost User

published last yr. modified 4mo ago also GHSA-qh58-9v3j-wcjc , GO-2025-3769 , EUVD-2025-28315

cvss
9.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
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 sanitize filenames in the archive extractor which allows authenticated users to write files to arbitrary locations on the filesystem via uploading archives with path traversal sequences in filenames, potentially leading to remote code execution. The vulnerability impacts instances where file uploads and document search by content is enabled (FileSettings.EnableFileAttachments = true and FileSettings.ExtractContent = true). These configuration settings are enabled by default.

Patch / fix

  • go github.com/mattermost/mattermost-server 0.0.0-20250519205859-65aec10162f6, 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 8.0.0-20250519205859-65aec10162f6, 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

Is CVE-2025-4981 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

1.02% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).

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
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
<0.0.0-20250519205859-65aec10162f6
>=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
0.0.0-20250519205859-65aec10162f6
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
<8.0.0-20250519205859-65aec10162f6
>=10.5.0, <10.5.6
>=9.11.0, <9.11.16
>=10.8.0, <10.8.1
>=10.7.0, <10.7.3
>=10.6.0, <10.6.6
8.0.0-20250519205859-65aec10162f6
10.5.6
9.11.16
10.8.1
10.7.3
10.6.6
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-427 Uncontrolled Search Path Element

References

Sources

Fencer Intel 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.