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9.4

Zabbix 7.4 can let attackers create fake login cookies

CVE-2026-23933 · published 1 month ago
Summary

Zabbix version 7.4 stores a secret key in the database that should stay hidden. If you use both SAML login and allow guest users, an attacker could use that key to make a fake session cookie and gain access without permission. Update Zabbix to a version that corrects this or disable the guest/SAML combination until patched.

What to do
  • Update zabbix zabbix to version 7.4.11.
Affected software
Ecosystem VendorProductAffected versions
– zabbix zabbix <= 7.4.10
>= 7.4.0, < 7.4.11
Fix: upgrade to 7.4.11
Ubuntu:Pro:14.04:LTS canonical zabbix All versions
Ubuntu:Pro:16.04:LTS canonical zabbix All versions
Ubuntu:Pro:18.04:LTS canonical zabbix All versions
Ubuntu:Pro:20.04:LTS canonical zabbix All versions
Ubuntu:Pro:22.04:LTS canonical zabbix All versions
Ubuntu:26.04:LTS canonical zabbix All versions
Original advisory text
In Zabbix 7.4 the cryptographic key used for signing Frontend sessions has been erroneously written to the database seed. Currently the only known exploitation scenario is for deployments that util...
In Zabbix 7.4 the cryptographic key used for signing Frontend sessions has been erroneously written to the database seed. Currently the only known exploitation scenario is for deployments that utilize both - SAML authentication and guest users. In such cases the key can be used to forge valid session cookies, potentially leading to unauthorized access. For other Zabbix deployments this does not have a known impact.
References
Severity
9.4 Critical
CVSS 4.0: 9.4 (OSV)
Exploitation
EPSS <1%
Type
CWE-259Use of Hard-coded Password
Timeline
Published18 Aug 2026
Updated27 Sep 2026
First seen18 Aug 2026
Sources
UBUNTU-CVE-2026-23933 · OSV
CVE-2026-23933 · NVD
CVE-2026-23933 · MITRE
CVE-2026-23933 · OSV
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