CVE-2026-23931 Frontend plaintext macro value enumeration via the validatate.api.exists action

Medium 5.3 Published 18 Aug 2026 Updated 18 Aug 2026

Authenticated users can extract plaintext macro values via the validate.api.exists action, compromising confidentiality.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-23931?

CVE-2026-23931 is a medium-severity vulnerability in Zabbix Zabbix, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The frontend validatate.api.exists action can be exploited by authenticated users to extract plaintext user macro values leading to potential loss of confidentiality.

Weakness: CWE-203

Which versions are affected by CVE-2026-23931?

It affects 1 product.

Products include Zabbix Zabbix.

How do I fix CVE-2026-23931?

No fix has been published for CVE-2026-23931 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-23931 being exploited?

There is no known exploitation of CVE-2026-23931 in the wild and no public exploit code.

All Zabbix Zabbix vulnerabilities

Sources

Also known as GHSA-9gr5-72qc-m8xc, UBUNTU-CVE-2026-23931.