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CVE-2026-23929

Prototype pollution leading to stored XSS

MEDIUM
5.4
CVSS Score
Published: August 18, 2026 at 12:16 PM UTC
Updated: September 8, 2026 at 03:21 PM UTC
1 product affected across 1 vendorZabbix

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zabbix· Zabbix
95%
6.0.0 ≤ v < 6.0.466.0.44 ≤ v ≤ 6.0.457.0.0 ≤ v < 7.0.257.0.22 ≤ v ≤ 7.0.247.4.0 ≤ v < 7.4.97.4.6 ≤ v ≤ 7.4.86.0.447.0.227.4.6
Affected range stops below 6.0.46, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.25, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://support.zabbix.com/browse/ZBX-28068

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1321

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