CVE-2026-93483 Znuny - Authentication Bypass

Znuny through 7.3.6 contains an authentication bypass caused by trusting the attacker-controlled Remote-User HTTP header in HTTPBasicAuth modules, letting attackers impersonate any user including administrators without a password.

CVSS base score 9.5 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:L/U:Red
Published
15 October 2026
Updated
15 October 2026
Weakness
CWE-348

Vendor fix

Update to a version later than 7.3.6 or the latest available version.

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

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