6.1med
CVE-2017-18879
Mattermost Server is vulnerable to XSS through author_link field in Slack attachments
Also known as GHSA-498j-wxww-j897, GO-2025-4189
Published 6 y ago · modified 4 mo ago · JSON
CVSS
6.1
v3.1 · NVD
CISA KEV
No
not known exploited
EPSS
0.7%
percentile 53%
Public exploits
0
none known
Summary
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS could occur via the author_link field of a Slack attachment.
Exploit prediction (EPSS)
0.69% probability of exploitation in the next 30 days, higher than 53% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | <4.1.2 >=4.2.0, <4.2.1 >=4.3.0-rc1, <4.3.0 <4.1.2+incompatible >=4.2.0+incompatible, <4.2.1+incompatible >=4.3.0-rc1+incompatible, <4.3.0+incompatible | 4.1.2 4.2.1 4.3.0 4.1.2+incompatible 4.2.1+incompatible 4.3.0+incompatible |
Classification
- Weakness
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
- mattermost.com /security-updates/ · x_refsource_CONFIRM, x_transferred
- nvd.nist.gov /vuln/detail/CVE-2017-18879 · advisory
- github.com /mattermost/mattermost · package
- mattermost.com /security-updates · web
- github.com /advisories/GHSA-498j-wxww-j897 · advisory
Sources
- CVE List: CVE-2017-18879
- GitHub Advisory: GHSA-498j-wxww-j897
- NVD: CVE-2017-18879
- OSV: GO-2025-4189
vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.