What’s Vulnerable › Vulnerabilities
CVE-2026-23933: Hardcoded session key in Zabbix 7.4
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-18 · updated 2026-09-23
- Weakness: CWE-259
Description
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.
Affected products
- Zabbix: from 7.4.0 before 7.4.11 — fixed in 7.4.11
How to fix
Upgrade to a fixed version: Zabbix 7.4.11. Check the vendor advisory for mitigations.
References
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