How severe is CVE-2023-43804?

CVE-2023-43804 has a CVSS score of 5.9/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-43804?

Affected package information for CVE-2023-43804 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-43804?

No fixed version has been published for CVE-2023-43804 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-43804 actively exploited in the wild?

No public exploit code has been indexed for CVE-2023-43804 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2023-43804?

CVE-2023-43804 has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 77th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

CVE-2023-43804

Q: Can O3 Security detect CVE-2023-43804 in my codebase?

Yes. O3 Security's Impact-Aware SCA scanner identifies CVE-2023-43804 across all affected ecosystems (multiple ecosystems), correlates it against your dependency graph, and uses function-level reachability to confirm whether the vulnerable code path is actually reachable in your application — eliminating false positives. You can scan your stack for CVE-2023-43804 directly from the O3 platform.

MEDIUM

`Cookie` HTTP header isn't stripped on cross-origin redirects

Also known asGHSA-v845-jxx5-vc9fPYSEC-2023-192

Published

Oct 4, 2023

Updated

Apr 10, 2026

Affected

0 pkgs

Patched

None yet

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk77th percentile0.00%

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.

Description

urllib3 is a user-friendly HTTP client library for Python. urllib3 doesn't treat the Cookie HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a Cookie header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.

Frequently Asked Questions

urllib3 is a user-friendly HTTP client library for Python. urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.

O3 Security · Impact-Aware SCA

Is CVE-2023-43804 in your stack?

O3 detects CVE-2023-43804 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

5.9/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

High

PR:Privileges Required

High

UI:User Interaction