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CVE-2026-23933

Zabbix hard-coded credentials

9.1 CRITICALEPSS 0.36%
  1. Published18 Aug 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Zabbix≥ 7.4.0 < 7.4.11

Remediation

Fixed in
Zabbix≥ 7.4.11

References

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Frequently asked

Is CVE-2026-23933 being actively exploited?

CVE-2026-23933 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.36%.

How severe is CVE-2026-23933?

CVE-2026-23933 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.36% probability of exploitation.

Which products are affected by CVE-2026-23933?

Affected products include Zabbix.

How do I fix CVE-2026-23933?

Upgrade affected software to a fixed version, for example Zabbix 7.4.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-23933 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.