Cross-Site Scripting Vulnerability in Mediawiki's CirrusSearch Extension
CVE-2026-96873

5.5MEDIUM

Key Information:

Vendor

The Wikimedia Foundation

Status
Mediawiki - Cirrussearch Extension
Vendor
CVE Published:
24 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-96873?

An improper input neutralization vulnerability in the Mediawiki - CirrusSearch extension allows attackers to execute arbitrary JavaScript code in a user's browser. This reflected cross-site scripting (XSS) flaw primarily affects versions of CirrusSearch up to 1.46.0, enabling potential exploitation when users interact with maliciously crafted links. Stay informed to protect your deployment from this security risk.

Affected Version(s)

Mediawiki - CirrusSearch Extension 0 <= 1.46.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-96873
Created by BomboBombone

References

https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cir...
https://phabricator.wikimedia.org/T435234

CVSS V4

Score:
5.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

bombobombone
.