CVE-2025-9081: mattermost
CVSS: 6.5v3.1MediumAnalyzed
AliasesGHSA-f72g-52v7-mg3pGO-2025-3978
Published 19-09-2025Last modified 19-09-2025
Vulnerability summary
CVE-2025-9081 is a medium (CVSS 6.5) vulnerability in mattermost. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.6% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
0.27%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 3 · Related 3Timeline
- 19-09-2025PublishedVulnerability first disclosed.
- 19-09-2025Last modifiedVulnerability information updated.
Description
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration
CVSS metrics
3 scores · 3 sources · 1 versionMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:NSources3 sources · 3.1–6.5
- CVE.orgCNA3.1LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NDiffers
- OSV · GoEcosystem advisory · calculated3.1LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NDiffers
EPSS trend
Probability
0.27%
Chance of exploitation in the next 30 days
Percentile
19%
Versus all other CVEs
30-day change
+0.01 pp
From 0.27% on 19-09-2026
19-09-202619-10-2026
EPSS score0.27%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Github.com/mattermost2 products
- mattermost-plugin-boards< 0.0.0-20250716054606-3f3e3becfe1d
- mattermost-server≥ 10.5.0-rc1, < 10.5.9 | ≥ 9.11.0-rc1, < 9.11.18 | ≥ 10.5.0-rc1+incompatible, < 10.5.9+incompatible
Github.com/mattermost/mattermost-server2 products
- v5All versions (No fix recorded)
- v6All versions (No fix recorded)
Mattermost2 products
- mattermost≥ 10.5.0, ≤ 10.5.8 | ≥ 9.11.0, ≤ 9.11.17
- mattermost_server≥ 9.11.0, < 9.11.17 | ≥ 10.5.0, < 10.5.9
Github.com/mattermost/mattermost/server1 product
- v8< 8.0.0-20250721095935-11c36f4d1e44
4 vendors · 7 products
