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CVE-2024-38537

27
FAUCET Score

CVE-2024-38537 is a critical vulnerability affecting the ethyca fides privacy engineering platform, specifically its fides.js client-side script. It allowed malicious script execution from the compromised polyfill.io domain for users of legacy browsers (e.g., IE11) that did not support the fetch standard. With a CVSS score of 9.8 (CRITICAL), the vulnerability had high impacts on confidentiality, integrity, and availability, though it required user interaction with a vulnerable browser. While no active exploitation has been identified, the vulnerability was patched in Fides version 2.39.1, and a domain-level intervention on June 27, 2024, rendered it unexploitable.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.39.1CPE matchmatch criteria
cpe:2.3:a:ethyca:fides:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

0.0NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
0.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.43%
Probability of exploitation in next 30 days
EPSS Percentile
70.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0143 is in the 57th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: ethyca-fidesFixed in: 2.39.1

Vendor Advisories (1)

pipGHSA-cvw4-c69g-7v7mlow

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

Jul 2, 2024

References

fetch.spec.whatwg.org
Product
github.com / ethyca/fides/commit/868c4d629760572192bd61db34f5a4458ed12005
Patch
github.com / ethyca/fides/pull/5026
Issue TrackingPatch
github.com / ethyca/fides/security/advisories/GHSA-cvw4-c69g-7v7m
PatchThird Party Advisory
sansec.io / research/polyfill-supply-chain-attack
Product