CVE-2024-31223 is a medium-severity (CVSS 5.3) CWE-497 vulnerability in ethyca-fides. A fix is available for ethyca-fides — see the affected versions and patch details below.
Fides Information Disclosure Vulnerability in Privacy Center of SERVER_SIDE_FIDES_API_URL
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-31223.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2024-31223 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,156 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
ethyca-fidesReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
SERVER_SIDE_FIDES_API_URL is a server-side configuration environment variable used by the Fides Privacy Center to communicate with the Fides webserver backend. The value of this variable is a URL which typically includes a private IP address, private domain name, and/or port.
This vulnerability allows an unauthenticated attacker to make a HTTP GET request from the Privacy Center that discloses the value of this server-side URL.
Impact
Disclosure of server-side configuration giving an attacker information on server-side ports, private IP addresses, and/or private domain names.
Patches
The vulnerability has been patched in Fides version 2.39.2. Users are advised to upgrade to this version or later to secure their systems against this threat.
Workarounds
There are no workarounds.
Proof of Concept
-
Set the value of the environment variable
FIDES_PRIVACY_CENTER__SERVER_SIDE_FIDES_API_URLof your Fides Privacy Center container before start-up to a private value such ashttps://some.private.domain.name/api/v1and start the Privacy Center application. -
Once the application is up, perform a HTTP GET request of the Privacy Center's main page e.g.
https://privacy.example.com. The value ofSERVER_SIDE_FIDES_API_URLis returned in the response's body.
~ ❯ curl -s https://privacy.example.com/ | \
grep '__NEXT_DATA__' | \
sed 's/.*<script id="__NEXT_DATA__" type="application\/json">//;s/<\/script>.*//' | \
jq '.props.serverEnvironment.settings.SERVER_SIDE_FIDES_API_URL'
"https://some.private.domain.name/api/v1"
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | ethyca-fides | ≥ 2.19.0&&< 2.39.2 | 2.39.2pip install --upgrade 'ethyca-fides==2.39.2' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ethyca-fides, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update ethyca-fides to 2.39.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-31223 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2024-31223 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2024-31223. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
How to detect CVE-2024-31223
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2024-31223 -u https://target- Template
- Fides Privacy Center ≤ 2.39.1 - Server-Side URL Disclosure
- Severity
- medium
- Impact
- Attackers can obtain server-side URLs, revealing private IPs, ports, and domain names, potentially aiding further targeted attacks.
- Remediation
- Update to version 2.39.2rc0 or later.
Template by ProjectDiscovery nuclei-templates (hnd3884), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2024-31223 in your dependencies?
O3 Security finds CVE-2024-31223 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.