{"cve":"CVE-2024-38537","nvd":{"published":"2024-07-02T20:15:05.860","modified":"2026-06-17T07:40:29.600","status":"Analyzed","description":"Fides is an open-source privacy engineering platform. `fides.js`, a client-side script used to interact with the consent management features of Fides, used the `polyfill.io` domain in a very limited edge case, when it detected a legacy browser such as IE11 that did not support the fetch standard. Therefore it was possible for users of legacy, pre-2017 browsers who navigate to a page serving `fides.js` to download and execute malicious scripts from the `polyfill.io` domain when the domain was compromised and serving malware. No exploitation of `fides.js` via `polyfill.io` has been identified as of time of publication.\n\nThe vulnerability has been patched in Fides version `2.39.1`. Users are advised to upgrade to this version or later to secure their systems against this threat. On Thursday, June 27, 2024, Cloudflare and Namecheap intervened at a domain level to ensure `polyfill.io` and its subdomains could not resolve to the compromised service, rendering this vulnerability unexploitable. Prior to the domain level intervention, there were no server-side workarounds and the confidentiality, integrity, and availability impacts of this vulnerability were high. Clients could ensure they were not affected by using a modern browser that supported the fetch standard.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-829"],"references":["https://fetch.spec.whatwg.org","https://github.com/ethyca/fides/commit/868c4d629760572192bd61db34f5a4458ed12005","https://github.com/ethyca/fides/pull/5026","https://github.com/ethyca/fides/security/advisories/GHSA-cvw4-c69g-7v7m","https://sansec.io/research/polyfill-supply-chain-attack"],"products":["ethyca:fides"],"source":"nvd","synced_at":"2026-10-19T21:52:00.836172422+00:00"},"epss":{"cve":"CVE-2024-38537","score":0.01427,"percentile":0.72969,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-cvw4-c69g-7v7m","url":"https://osv.dev/vulnerability/GHSA-cvw4-c69g-7v7m","summary":"Inclusion of Untrusted polyfill.io Code Vulnerability in fides.js","modified":"2026-09-10T03:50:16.583924678Z","packages":[{"ecosystem":"PyPI","name":"ethyca-fides","purl":"pkg:pypi/ethyca-fides","ranges":["<2.39.1"],"fixed":["2.39.1"]}]},{"id":"PYSEC-2026-1339","url":"https://osv.dev/vulnerability/PYSEC-2026-1339","summary":"Inclusion of Untrusted polyfill.io Code Vulnerability in fides.js","modified":"2026-07-07T17:46:40.258942503Z","packages":[{"ecosystem":"PyPI","name":"ethyca-fides","purl":"pkg:pypi/ethyca-fides","ranges":["<2.39.1"],"fixed":["2.39.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}