EIP-2026-103707

PRE-CVE

WebKit - Universal XSS in JSObject::putInlineSlow and JSValue::putToPrimitive

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-103707. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit leverages a prototype chain pollution vulnerability in WebKit's `putInlineSlow` function to bypass access checks and trigger cross-origin setter execution, leading to a Universal XSS (UXSS) via exception leakage.

Description

WebKit - Universal XSS in JSObject::putInlineSlow and JSValue::putToPrimitive

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · textdosmultiple
https://www.exploit-db.com/exploits/47591

This exploit leverages a prototype chain pollution vulnerability in WebKit's `putInlineSlow` function to bypass access checks and trigger cross-origin setter execution, leading to a Universal XSS (UXSS) via exception leakage.

Classification
Working Poc 90%
Attack Type
Xss
Complexity
Moderate
Reliability
Reliable
Target: WebKit revision 247430, Safari 12.1.1
No auth needed
Prerequisites: Victim page must define a custom accessor property on the `location` object · Attacker must control or influence a frame/iframe context
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026