CVE-2017-18879 — Cross-site Scripting in Mattermost Mattermost-server

CWE-79 — Cross-site Scripting5 documents4 sources
Severity
6.1MEDIUMNVD
EPSS
0.4%
top 41.86%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Github.com Mattermost Mattermost-serverMattermost Server
Timeline
PublishedJun 19
Latest updateDec 8

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitability: 2.8 | Impact: 2.7

Affected Packages2 packages

▶NVDmattermost/mattermost_server4.2.0 — 4.2.1+2
▶Gogithub.com/mattermost_mattermost-server4.2.0+incompatible — 4.2.1+incompatible+5

🔴Vulnerability Details

4
OSV
Mattermost Server is vulnerable to XSS through author_link field in Slack attachments in github.com/mattermost/mattermost-server↗2025-12-08
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GHSA
Mattermost Server is vulnerable to XSS through author_link field in Slack attachments↗2022-05-24
▶
OSV
Mattermost Server is vulnerable to XSS through author_link field in Slack attachments↗2022-05-24
▶
CVEList
CVE-2017-18879: An issue was discovered in Mattermost Server before 4↗2020-06-19
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CVE-2017-18879 — Cross-site Scripting | cvebase