CVE-2026-23933

Hardcoded session key in Zabbix 7.4

Published Aug 18, 2026 CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Upgrade Zabbix Server to the latest version, an upgrade patch will remove the session key from the DB.


Vendor Workaround

As a workaround, the pre-seeded session key can be manually cleared from Zabbix DB by setting value of 'settings.session_key' to an empty string. Zabbix Frontend will then generate a new random key.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Zabbix
Zabbix zabbix
Vendors & Products Zabbix
Zabbix zabbix
Type Values Removed Values Added
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.
Title Hardcoded session key in Zabbix 7.4
Weaknesses CWE-259
References
Metrics cvssV4_0

{'score': 7.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Zabbix
Published
Updated
Aug 19, 2026, 3:55 AM
Reserved
Jan 19, 2026, 2:03 PM
Status
Analyzed
Published
Aug 18, 2026, 1:17 PM
Modified
Sep 23, 2026, 2:31 PM