CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2017-18898
Medium (5.3) in mattermost mattermost server. EPSS 1.1% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-server 4.0.5, 4.0.5+incompatible, 4.1.1.
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows crafted posts that potentially cause a web browser to hang.
Severity
- EPSS
- 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
- CWE
- CWE-404
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9589-mq83-f749 | Go | github.com/mattermost/mattermost-server | <4.0.5 | 4.0.5 |
| GHSA-9589-mq83-f749 | Go | github.com/mattermost/mattermost-server | >=4.1.0 <4.1.1 | 4.1.1 |
| GHSA-9589-mq83-f749 | Go | github.com/mattermost/mattermost-server | >=4.2.0-rc1 <4.2.0 | 4.2.0 |
| GO-2026-4300 | Go | github.com/mattermost/mattermost-server | <4.0.5+incompatible >=4.1.0+incompatible <4.1.1+incompatible >=4.2.0-rc1+incompatible <4.2.0+incompatible | 4.0.5+incompatible, 4.1.1+incompatible, 4.2.0+incompatible |