CVE-2026-74864 Details
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.
A vulnerability in YunoHost-Apps SOGo version 5.8.0~ynh9 and prior allows for authorization bypass through the manipulation of the 'x-webobjects-remote-user' HTTP header. This header can be sent by any client and is accepted as proof of user verification without requiring password validation. As a result, an attacker can gain access to any user account, including those with privileged rights, without needing to provide a password. This issue arises because Nginx does not remove the 'x-webobjects-remote-user' header, allowing arbitrary clients to exploit this vulnerability.
Users are advised to upgrade to SOGo version 5.8.0~ynh9 or later.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 30, 2026CISA-ADP
Assessed Sep 30, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert.pl/en/posts/2026/09/CVE-2026-74864 | [email protected] | AdvisoryBundleRemedy |
| https://forum.yunohost.org/t/sogo-critical-vulnerability-fixed-in-5-8-0-ynh9/42699 | [email protected] | AdvisoryVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| YunoHost-Apps sogo_yhn | < 5.8.0~ynh9 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 30, 2026 | New CVE Received | [email protected] |
| Sep 30, 2026 | CVE Modified | CISA-ADP |