CVSS 3.1
6.1 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NCVE-2017-18877
Medium (6.1) in mattermost mattermost server. EPSS 0.7% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-server 4.1.2, 4.1.2+incompatible, 4.2.1.
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS attacks could occur against an OAuth 2.0 allow/deny page.
Severity
- EPSS
- 0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9x8x-w6g5-hx4w | Go | github.com/mattermost/mattermost-server | <4.1.2 | 4.1.2 |
| GHSA-9x8x-w6g5-hx4w | Go | github.com/mattermost/mattermost-server | >=4.2.0 <4.2.1 | 4.2.1 |
| GHSA-9x8x-w6g5-hx4w | Go | github.com/mattermost/mattermost-server | >=4.3.0-rc1 <4.3.0 | 4.3.0 |
| GO-2025-4190 | Go | github.com/mattermost/mattermost-server | <4.1.2+incompatible >=4.2.0+incompatible <4.2.1+incompatible >=4.3.0-rc1+incompatible <4.3.0+incompatible | 4.1.2+incompatible, 4.2.1+incompatible, 4.3.0+incompatible |