CVE-2026-93582 OTRS Community Edition - Authentication Bypass

OTRS Community Edition <= 6 contains an authentication bypass caused by trusting HTTP_REMOTE_USER environment variable from attacker-controlled HTTP headers, letting unauthenticated remote attackers impersonate users, exploit requires HTTP Basic Authentication backend and vulnerable web server environment.

CVSS base score 9.4 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.39% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication, Data Tampering, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Published
12 October 2026
Updated
15 October 2026
Weakness
CWE-290

Vendor fix

Upgrade to OTRS 7 or later where this issue is fixed or apply security hardening to remove HTTP_REMOTE_USER fallback.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs