CVE-2024-38537: fides — Fix

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. 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.

Is your site exposed to CVE-2024-38537?

Run a free security scan — no signup, results in seconds.

Weakness Type (CWE)

CWE-829 CWE-829

Affected Products

Vendor	Product	Versions
ethyca	fides	< 2.39.1

References

Advisories & Patches

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://github.com/ethyca/fides/commit/868c4d629760572192bd61db34f5a4458ed12005 https://github.com/ethyca/fides/pull/5026 https://github.com/ethyca/fides/security/advisories/GHSA-cvw4-c69g-7v7m

Other References

https://fetch.spec.whatwg.org https://sansec.io/research/polyfill-supply-chain-attack https://fetch.spec.whatwg.org https://sansec.io/research/polyfill-supply-chain-attack

Frequently Asked Questions

What is CVE-2024-38537? +

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.

What products are affected by CVE-2024-38537? +

CVE-2024-38537 affects products from ethyca, specifically: fides. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-38537? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-46529

Atril Document Viewer is the default document reader of the MATE desktop environment for Linux. A single-click remote code execution …

CVE-2025-34074

An authenticated remote code execution vulnerability exists in Lucee’s administrative interface due to insecure design in the scheduled task functionality. …

CVE-2024-45482

An Inclusion of Functionality from Untrusted Control Sphere vulnerability in the SSH server on B&R APROL <4.4-00P1 may allow an …

CVE-2025-24796

Collabora Online is a collaborative online office suite based on LibreOffice. Macro support is disabled by default in Collabora Online, …

CVE-2025-27510

conda-forge-metadata provides programatic access to conda-forge's metadata. conda-forge-metadata uses an optional dependency - "conda-oci-mirror" which was neither present on the …

CVE-2026-47781

PDM is a Python package and dependency manager. In versions up to and including 2.26.9, PDM automatically loads project-local plugins …

CVE-2024-38537