CVE-2017-18876 — Incorrect Permission Assignment in Mattermost Mattermost-server

CWE-732 — Incorrect Permission AssignmentCWE-22 — Path Traversal5 documents4 sources
Severity
4.9MEDIUMNVD
EPSS
0.3%
top 50.80%
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 when local storage for files is used. A System Admin can test for the existence of an arbitrary file.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:NExploitability: 1.2 | Impact: 3.6

Affected Packages2 packages

▶NVDmattermost/mattermost_server4.2.0 — 4.2.1+2
▶Gogithub.com/mattermost_mattermost-server4.2.0-rc1.0.20171004154238-fadd9514f6e7 — 4.2.1-0.20171004194140-6d3cb2ce07fc+3

🔴Vulnerability Details

4
OSV
Mattermost Server is vulnerable to Path Traversal when files are stored locally in github.com/mattermost/mattermost-server↗2025-12-08
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GHSA
Mattermost Server is vulnerable to Path Traversal when files are stored locally↗2022-05-24
▶
OSV
Mattermost Server is vulnerable to Path Traversal when files are stored locally↗2022-05-24
▶
CVEList
CVE-2017-18876: An issue was discovered in Mattermost Server before 4↗2020-06-19
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CVE-2017-18876 — Incorrect Permission Assignment | cvebase