CVE-2026-42042

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

State: Published
Severity: 5.4 Medium
Published: Apr 24, 2026
Updated: Apr 27, 2026
Reserved: Apr 23, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N	GitHub_M

Weaknesses

CWE-183 Permissive List of Allowed Inputs
CWE-201 Insertion of Sensitive Information Into Sent Data

Affected Products

Product	Versions
axiosaxios	>= 1.0.0, < 1.15.1Affected < 0.31.1Affected

References

https://github.com/axios/axios/security/advisories/GHSA-xx6v-rp6x-q39c

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.