{"id":"CVE-2026-42042","aliases":["GHSA-xx6v-rp6x-q39c"],"url":"https://o3.security/vulnerability/CVE-2026-42042","summary":"Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion","details":"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.","published":"2026-04-24T18:03:29.924Z","modified":"2026-08-07T11:31:06.328130343Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"axios","fixedVersion":"1.15.1"},{"ecosystem":"npm","name":"axios","fixedVersion":"0.31.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42042.json"},{"type":"ADVISORY","url":"https://github.com/axios/axios/security/advisories/GHSA-xx6v-rp6x-q39c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42042"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:06.328130343Z"}}