Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
The HTTP Basic Authentication modules in ((OTRS)) Community Edition 6 and prior accept the authenticated username from either the REMOTE_USER or HTTP_REMOTE_USER environment variable. In CGI and mod_perl based deployments, HTTP request headers may be mapped to corresponding HTTP_* environment variables. As a result, an unauthenticated remote attacker can supply a crafted Remote-User request header which is exposed to the application as HTTP_REMOTE_USER. When HTTP Basic Authentication is configured as the authentication backend, OTRS trusts this value as an already authenticated username and does not perform an additional password verification. An attacker may therefore authenticate through the Generic Interface as an existing agent or customer user without knowing the corresponding credentials. The resulting privileges depend on the account being impersonated. Successful exploitation may allow access to confidential information and modification of data or configuration with the permissions of the affected user. Exploitation requires HTTP Basic Authentication to be configured as an authentication backend and a web server environment in which attacker-controlled HTTP headers are exposed through the corresponding HTTP_* environment variables. OTRS 7 and later are not affected by this attack vector due to the use of Mojolicious/Hypnotoad and does not expose arbitrary request headers through %ENV in the manner required for exploitation. The supported REMOTE_USER mechanism additionally requires validation through the configured SSO shared secret. The unused HTTP_REMOTE_USER fallback has nevertheless been removed as a security-hardening measure. Please note that ((OTRS)) Community Edition 6.x and before are vulnerable. Products based on the ((OTRS)) Community Edition also very likely to be affected
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
STABLE
OTRS Community Edition 6 and earlier has a CVSS 9.4 auth issue (CVE-2026-93582). Review deployments and apply updates. https://nvd.nist.gov/vuln/detail/CVE-2026-93582 via NVD Recent High CVSS #CyberSecurity #InfoSec #Vulnerability #AI #MachineLearning https://t.co/Jkt0KoBxco
#NØØT_Security_Alerts 🚨 #ALERT — CRITICAL OTRS AUTHENTICATION BYPASS ENABLES REMOTE USER IMPERSONATION October 12, 2026 DISCLOSED BY: OTRS Security Response Team PRODUCT: ((OTRS)) Community Edition CVE: CVE-2026-93582 SEVERITY: Critical — CVSS 9.4 AFFECTED VERSIONS: Community Edition 6.x and earlier. Derived products may also be affected. OTRS 7 and later are not vulnerable to this attack vector. IMPACT: Unauthenticated attackers can impersonate existing agents or customers by supplying a forged Remote-User HTTP header. Vulnerable installations may trust HTTP_REMOTE_USER without verifying the account password. Successful exploitation grants the impersonated user’s permissions, potentially exposing confidential tickets, customer information and administrative configuration. EXPOSURE: HTTP Basic Authentication must be configured as the authentication backend, with CGI/mod_perl infrastructure exposing attacker-controlled HTTP headers as environment variables. EXPLOITATION STATUS: VENDOR-CONFIRMED VULNERABILITY. No verified public working PoC or confirmed in-the-wild exploitation. Forensic triage: Inspect available reverse-proxy and application logs for suspicious Remote-User headers, unexpected Generic Interface authentication, anomalous agent sessions and unauthorized ticket or configuration changes. No confirmed malicious infrastructure IOCs. URGENT ACTION: Identify exposed legacy OTRS installations. Disable the vulnerable authentication configuration, reject untrusted identity headers and restrict external access. Migrate to a maintained, unaffected release. OTRS recommends version 2026.7.1 or later. SOURCE: https://otrs.com/release-notes/otrs-security-advisory-2026-18/ OFFICIAL CVE: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/93xxx/CVE-2026-93582.json CONFIDENCE: HIGH — OTRS-authored CVE record confirms the vulnerability, exploitation prerequisites and affected versions. Real-world malicious exploitation remains unverified. #CyberSecurity #ThreatIntel #OTRS #AuthenticationBypass #PrivilegeEscalation