CVE-2026-93483
- Source
- https://cve.org/CVERecord?id=CVE-2026-93483
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93483.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-93483
- Downstream
- Published
- 2026-10-15T03:43:10Z
- Modified
- 2026-10-16T03:00:34Z
- Severity
-
- 9.5 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/AU:Y/R:U/RE:L/U:Red CVSS Calculator
- Summary
- [none]
- Details
-
In Znuny through 7.3.6, an attacker can bypass specific standard login procedures and gain unauthorized access to sensitive system functions by manipulating a specific HTTP request header. Because the application incorrectly trusts this header, an attacker can impersonate any user, including administrators, without requiring a password. This grants full access to confidential data and system controls. More specifically, the HTTPBasicAuth modules for the agent (Kernel::System::Auth::HTTPBasicAuth) and customer (Kernel::System::CustomerAuth::HTTPBasicAuth) interfaces read the username to log in not only from $ENV{REMOTE_USER} (set by the web server after successful authentication), but also, as a fallback, from $ENV{HTTP_REMOTE_USER}, which is populated directly from an attacker-controllable "Remote-User" request header. On systems where HTTPBasicAuth was configured as the authentication backend, this allowed an attacker to log in as any existing user by sending a request with a forged Remote-User header, without providing any credentials.
- Database specific
{ "cna_assigner": "mitre", "cwe_ids": [ "CWE-348" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93483.json" }- References
Affected packages
Git / github.com/znuny/znuny
Affected ranges
- Type
- GIT
- Repo
- https://github.com/znuny/znuny
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "0" }, { "fixed": "6.5.25" }, { "introduced": "7.0.0" }, { "fixed": "7.3.7" } ], "source": "AFFECTED_FIELD" }