CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2017-18871
High (7.5) in mattermost mattermost server. EPSS 1.1% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-server 4.2.2, 4.2.2+incompatible, 4.3.4.
An issue was discovered in Mattermost Server before 4.5.0, 4.4.5, 4.3.4, and 4.2.2. It allows attackers to cause a denial of service (application crash) via an @ character before a JavaScript field name.
Severity
- EPSS
- 1.1% chance of exploitation in the next 30 days; higher than 66% of CVEs (scores of 2026-11-01)
- Published
- Modified
- Record from
- the NVD, synced
Affected
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-jc6w-8r7f-vmp5 | Go | github.com/mattermost/mattermost-server | <4.2.2 | 4.2.2 |
| GHSA-jc6w-8r7f-vmp5 | Go | github.com/mattermost/mattermost-server | >=4.3.0-rc1 <4.3.4 | 4.3.4 |
| GHSA-jc6w-8r7f-vmp5 | Go | github.com/mattermost/mattermost-server | >=4.4.0-rc1 <4.4.5 | 4.4.5 |
| GHSA-jc6w-8r7f-vmp5 | Go | github.com/mattermost/mattermost-server | >=4.5.0-rc1 <4.5.0 | 4.5.0 |
| GO-2025-4184 | Go | github.com/mattermost/mattermost-server | <4.2.2+incompatible >=4.3.0-rc1+incompatible <4.3.4+incompatible >=4.4.0-rc1+incompatible <4.4.5+incompatible >=4.5.0-rc1+incompatible <4.5.0+incompatible | 4.2.2+incompatible, 4.3.4+incompatible, 4.4.5+incompatible, 4.5.0+incompatible |