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Inclusion of Untrusted polyfill.io Code Vulnerability in fides.js

Type: advisorySources: OSV

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. The 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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2024-38537
Confirmed fixed CVEs
Not specified
Updated in this feed
8 Nov 2026, 00:59 UTC · Revision 1

Source evidence

Inclusion of Untrusted polyfill.io Code Vulnerability in fides.js

core-osv · Original source

Published 2 Jul 2024, 19:50 UTC

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. The 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.

osv:CVE-2024-38537
Complete source record
{
  "id": "a5840f2c6beeb6afcf01cc93284b28d531bd06d98d7b494a39c78f018b1487ab",
  "url": "https://osv.dev/vulnerability/CVE-2024-38537",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Inclusion of Untrusted polyfill.io Code Vulnerability in fides.js",
    "summary": "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. The 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.",
    "evidence": "osv:CVE-2024-38537",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-38537",
      "aliases": [
        "CVE-2024-38537",
        "GHSA-cvw4-c69g-7v7m",
        "PYSEC-2026-1339"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ethyca/fides",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
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                {
                  "fixed": "c62b1f10cb72bcd2e6517ce4dd0bf3f15310d9de"
                },
                {
                  "fixed": "868c4d629760572192bd61db34f5a4458ed12005"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ethyca:fides:*:*:*:*:*:*:*:*",
                    "range": [
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                        "introduced": "0"
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                      {
                        "fixed": "2.39.1"
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                    "source": "CPE_RANGE"
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                  {
                    "range": [
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                    "source": "REFERENCES_COMMIT"
                  }
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          ],
          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-38537.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.717806692Z",
      "provider": "osv",
      "references": [
        "https://fetch.spec.whatwg.org",
        "https://sansec.io/research/polyfill-supply-chain-attack",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/38xxx/CVE-2024-38537.json",
        "https://github.com/ethyca/fides/security/advisories/GHSA-cvw4-c69g-7v7m",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-38537",
        "https://github.com/ethyca/fides/commit/868c4d629760572192bd61db34f5a4458ed12005",
        "https://github.com/ethyca/fides/pull/5026"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-829"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/38xxx/CVE-2024-38537.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-38537",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 521155,
  "published_at": "2024-07-02T19:50:10.275+00:00"
}