# CVE-2026-42042

> Vulnerability · severity: **MEDIUM** (CVSS 5.4).

## 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.

## Key facts

- **CVE ID:** CVE-2026-42042
- **Published:** 2026-04-24
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.4
- **CWE codes:** CWE-183, CWE-201

## Affected products

- `axios:axios`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42042

## Citation

> AI Analytics. CVE-2026-42042. Retrieved 2026-08-17 from https://api.ai-analytics.org/cve/CVE-2026-42042. Derived from NIST NVD. Licensed CC0.

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