CVE-2026-74864: CWE-639 Authorization bypass through User-Controlled key in YunoHost-Apps sogo_yhn
sogo_yhn configures SOGo with a parameter that forces the request with HTTP header "x-webobjects-remote-user" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password. This issue was fixed in version 5.8.0~ynh9.
AI Analysis
Technical Summary
The sogo_yhn application in YunoHost-Apps sets a configuration parameter that causes SOGo to treat requests containing the HTTP header "x-webobjects-remote-user" as authenticated without verifying credentials. Since Nginx does not strip this header, any client can forge it to gain unauthorized access as any user, including privileged users, bypassing authentication entirely. This is an authorization bypass vulnerability categorized under CWE-639. The issue was resolved in version 5.8.0~ynh9.
Potential Impact
An attacker can gain unauthorized access to the application as any user, including privileged users, without providing a password. This allows full impersonation and potential control over the affected system, representing a critical security risk.
Mitigation Recommendations
Upgrade sogo_yhn to version 5.8.0~ynh9 or later, where this vulnerability has been fixed. Until then, consider implementing controls to strip or block the "x-webobjects-remote-user" header at the web server or proxy level to prevent unauthorized header injection.
CVE-2026-74864: CWE-639 Authorization bypass through User-Controlled key in YunoHost-Apps sogo_yhn
Description
sogo_yhn configures SOGo with a parameter that forces the request with HTTP header "x-webobjects-remote-user" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password. This issue was fixed in version 5.8.0~ynh9.
CVSS v4.0
Score 9.3critical
Affected software
YunoHost-Apps
sogo_yhn
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The sogo_yhn application in YunoHost-Apps sets a configuration parameter that causes SOGo to treat requests containing the HTTP header "x-webobjects-remote-user" as authenticated without verifying credentials. Since Nginx does not strip this header, any client can forge it to gain unauthorized access as any user, including privileged users, bypassing authentication entirely. This is an authorization bypass vulnerability categorized under CWE-639. The issue was resolved in version 5.8.0~ynh9.
Potential Impact
An attacker can gain unauthorized access to the application as any user, including privileged users, without providing a password. This allows full impersonation and potential control over the affected system, representing a critical security risk.
Mitigation Recommendations
Upgrade sogo_yhn to version 5.8.0~ynh9 or later, where this vulnerability has been fixed. Until then, consider implementing controls to strip or block the "x-webobjects-remote-user" header at the web server or proxy level to prevent unauthorized header injection.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERT-PL
- Date Reserved
- 2026-08-17T10:19:51.723Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abd07622a4e24523d03fb28
Added to database: 09/30/2026, 12:58:10 UTC
Last enriched: 09/30/2026, 13:03:00 UTC
Last updated: 09/30/2026, 23:37:52 UTC
Views: 14
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