🛡️ CVE-2017-18884 — mattermost-server

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-269 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Mattermost Server exposes OAuth personal access tokens to attackers

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to gain privileges by using a registered OAuth application with personal access tokens.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2017-18884 is classified as CWE-269: Improper Privilege Management. Privileges are assigned, dropped or restored incorrectly, leaving an actor with more access than intended.

Affected software

CVE-2017-18884 is recorded against 1 package.

  • github.com/mattermost/mattermost-server

Timeline and source

Published on 24 May 2022 and last revised on 3 March 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
mattermost.com (Web)

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE CWE-269
Public Exploit ✅ No
Source OSV
Published 2022-05-24
Updated 2026-08-12
Modified 2026-03-03
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/mattermost/mattermost-server — —

Similar Threats

Exploit Protection

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