Security Digest · Vulnerability record
CVE-2025-25279: Mattermost allows reading arbitrary files related to importing boards
Mattermost versions 10.4.x
CVSS 9.9 Critical EPSS 24.2% · p98
Should you act?
High exploit likelihood
EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 24.2%, percentile 98: FIRST’s model estimates a 24.2% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes
github.com/mattermost/mattermost/server/v8(Go) < 8.0.0-20250122165010-4ed702ccff4e, fixed in 8.0.0-20250122165010-4ed702ccff4e;github.com/mattermost/mattermost/server/v8(Go) >= 9.11.0-rc1, < 9.11.8, fixed in 9.11.8;github.com/mattermost/mattermost/server/v8(Go) >= 10.2.0-rc1, < 10.2.3, fixed in 10.2.3;github.com/mattermost/mattermost/server/v8(Go) >= 10.3.0-rc1, < 10.3.3, fixed in 10.3.3. Check your lockfile, including transitive dependencies.
What it is
Mattermost versions 10.4.x
From the GitHub advisory
Mattermost versions 10.4.x
Weakness type: CWE-22.
Product: github.com/mattermost/mattermost/server/v8 (Go) · Assigned by: Mattermost · Published: 2025-02-24
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250122165010-4ed702ccff4e | 8.0.0-20250122165010-4ed702ccff4e |
| Go | github.com/mattermost/mattermost/server/v8 | >= 9.11.0-rc1, < 9.11.8 | 9.11.8 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.2.0-rc1, < 10.2.3 | 10.2.3 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.3.0-rc1, < 10.3.3 | 10.3.3 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.4.0-rc1, < 10.4.2 | 10.4.2 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Mattermost | Mattermost | 10.4.0 <= 10.4.1, 9.11.0 <= 9.11.7, 10.3.0 <= 10.3.2, 10.2.0 <= 10.2.2 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| Mattermost | 3.1 | 9.9 Critical | 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 |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: low (any account)
- User interaction: none
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 24.22% probability of exploitation activity in the next 30 days; percentile 98.
Timeline
- — CVE record last updated
- — CVE record published by Mattermost
- — GitHub-reviewed advisory GHSA-5fwx-p6xh-vjrh published (critical)
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-5fwx-p6xh-vjrh github.com
- CVE.org record CVE-2025-25279 cve.org
- NVD entry CVE-2025-25279 nvd.nist.gov
Other references from the CVE record and advisory
- mattermost.com mattermost.com
- github.com github.com
- github.com github.com