CVE-2026-23933CWE-259

CVE-2026-23933

Critical · published August 18, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
28.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
7.7 · 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
EPSS
0.00360 · 28.6th percentile
Weakness
CWE-259 · Use of Hard-coded Password
Published
2026-08-18T17:17Z
Affected products (1)
ProductVersionsFixed in
zabbix/zabbix≥ 7.4.0, < 7.4.117.4.11
References (1)
https://support.zabbix.com/browse/ZBX-28071 · [email protected]
EPSS history
Timeline
  • 18 AUG 12:18Z
    Hardcoded session key in Zabbix 7.4
    cvelistv5