Critical severity · published Apr 20, 2023
CVE-2023-2193
Mattermost fails to invalidate existing authorization codes when deauthorizing an OAuth2 app, allowing an attacker possessing an authorization code to generate an access token
9.1
CVSS
0.6%
EPSS
No
On KEV
Description
Mattermost fails to invalidate existing authorization codes when deauthorizing an OAuth2 app, allowing an attacker possessing an authorization code to generate an access token.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mattermost · Mattermost
7.1.7; 7.7.3; 7.8.2; 7.9.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-2193
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-2193
Vendor Advisory
https://mattermost.com/security-updates/
More from Mattermost
9.9
CVE-2026-4858
Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.
9.6
CVE-2024-39777
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels…
9.3
CVE-2026-12985
Mattermost DCR redirect URI allowlist bypass via improper URL component validation
9.1
CVE-2019-20851
An issue was discovered in Mattermost Mobile Apps before 1.26.0
8.8
CVE-2026-7387
Mattermost group syncable endpoints allow privilege escalation via scheme_admin