CVE-2026-23933
Critical
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.
SeverityCritical
CVSS9.1
Exploit probability—
Product
Zabbix
PublishedAug 18, 2026
First seenAug 18, 2026
Weakness typeCWE-259CWE-259
How to fix
Update
- zabbix zabbix7.4.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zabbix zabbix | 7.4.0 ≤ v < 7.4.11 | 7.4.11 |
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