Vulnerability · Published Aug 18, 2026 · Assigned by Zabbix
CVE-2026-23931Frontend plaintext macro value enumeration via the validatate.api.exists action
Medium 5.3
In plain English
A medium-severity security flaw in Zabbix from Zabbix. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)0.3%top 76.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | zabbix | no fix listed | DEBIAN-CVE-2026-23931 |
| Debian:13 | zabbix | no fix listed | DEBIAN-CVE-2026-23931 |
| Ubuntu:26.04:LTS | zabbix | no fix listed | UBUNTU-CVE-2026-23931 |
| Ubuntu:26.10 | zabbix | no fix listed | UBUNTU-CVE-2026-23931 |
Affected products (as reported)
Weakness: CWE-203 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N