CVE-2023-23928

reason-jose ignores signature checks

Description

reason-jose is a JOSE implementation in ReasonML and OCaml.`Jose.Jws.validate` does not check HS256 signatures. This allows tampering of JWS header and payload data if the service does not perform additional checks. Such tampering could expose applications using reason-jose to authorization bypass. Applications relying on JWS claims assertion to enforce security boundaries may be vulnerable to privilege escalation. This issue has been patched in version 0.8.2.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com
Affected: ulrikstrid reason-jose
Published at:
Updated at:

References

Link Tags
https://github.com/ulrikstrid/reason-jose/security/advisories/GHSA-7jj9-6qwv-wpm7 third party advisory
https://github.com/ulrikstrid/reason-jose/commit/36cd724db3cbec121757624da49072386bd869e5 third party advisory patch
https://github.com/ulrikstrid/reason-jose/releases/tag/v0.8.2 third party advisory release notes

Frequently Asked Questions

What is the severity of CVE-2023-23928?
CVE-2023-23928 has been scored as a medium severity vulnerability.
How to fix CVE-2023-23928?
To fix CVE-2023-23928, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-23928 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-23928 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-23928?
CVE-2023-23928 affects ulrikstrid reason-jose.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.