CVE-2026-42042CWE-183CWE-201

Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion

Medium · published April 24, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
24.2
In the wild
Unconfirmed
What it is

Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00324 · 24.2th percentile
Weaknesses
CWE-183 · Permissive List of Allowed Inputs; CWE-201 · Insertion of Sensitive Information Into Sent Data
Published
2026-04-24T18:03Z
EPSS history
Timeline
  • 24 APR 18:03Z
    Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion
    cvelistv5