Vulnerability · Published Aug 18, 2026 · Assigned by Zabbix
CVE-2026-23933Hardcoded session key in Zabbix 7.4
High 7.7
In plain English
A high-severity security flaw in Zabbix from Zabbix. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:26.04:LTS | zabbix | no fix listed | UBUNTU-CVE-2026-23933 |
| Ubuntu:26.10 | zabbix | no fix listed | UBUNTU-CVE-2026-23933 |
Affected products (as reported)
Weakness: CWE-259 · Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N