Vulnerability · Published Aug 18, 2026 · Assigned by Zabbix
CVE-2026-23929Prototype pollution leading to stored XSS
High 8.5
In plain English
A high-severity prototype pollution 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 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)8.5High
Exploit odds (30 days)0.3%top 82.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Prototype pollution vulnerability in searchParamsToObject() is leading to a persistent XSS in Maps. URL parameter processing was not filtering dangerous properties like __proto__, combined with jQuery's unsafe element creation that traversed the prototype chain.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | zabbix | no fix listed | DEBIAN-CVE-2026-23929 |
| Debian:13 | zabbix | no fix listed | DEBIAN-CVE-2026-23929 |
| Debian:14 | zabbix | 1:7.0.27+dfsg-1 | DEBIAN-CVE-2026-23929 |
| Ubuntu:26.04:LTS | zabbix | no fix listed | UBUNTU-CVE-2026-23929 |
| Ubuntu:26.10 | zabbix | no fix listed | UBUNTU-CVE-2026-23929 |
Affected products (as reported)
Weakness: CWE-1321 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N