CVE-2025-55073
MEDIUM5.4EPSS 0.04%Mattermost allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL
Published: 11/14/2025Modified: 11/18/2025
Description
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
Affected packages (6)
- Go/github.com/mattermost/mattermost-server>= 10.11.0, < 10.11.4
- Go/github.com/mattermost/mattermost-server>= 10.5.0+incompatible, < 10.5.12+incompatible, >= 10.11.0+incompatible, < 10.11.4+incompatible, >= 10.12.0+incompatible, < 10.12.1+incompatible
- Go/github.com/mattermost/mattermost-server/v5from 0
- Go/github.com/mattermost/mattermost-server/v6from 0
- Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20250929212932-a41db04d2746
- Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20250929212932-a41db04d2746
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
References (9)
- ADVISORYhttps://github.com/advisories/GHSA-ff85-qw3h-g9vp
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-55073
- PATCHhttps://github.com/mattermost/mattermost
- WEBhttps://github.com/mattermost/mattermost/commit/375ce229f4923205394d8f27925372b2cbf28130
- WEBhttps://github.com/mattermost/mattermost/commit/6c288aa62bb3343183ec1d0a06360d14aa0193e9
- WEBhttps://github.com/mattermost/mattermost/commit/a41db04d2746ab549d056db4ede4cd803f64989c
- WEBhttps://github.com/mattermost/mattermost/commit/b822cea06bf5683a176e2c92711241bd29cd9389
- WEBhttps://github.com/mattermost/mattermost/commit/e47349ea0fc072ee1dfb196d9bb1c8fd1a589224
- WEBhttps://mattermost.com/security-updates