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Security Advisories

CVE-2026-42042

NVD

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

Severity

5.4

Medium

CVSS V3

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Summary

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

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-42042
  • https://github.com/advisories/GHSA-xx6v-rp6x-q39c
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42042.json
  • https://github.com/axios/axios/security/advisories/GHSA-xx6v-rp6x-q39c

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