Vulnerability Description
Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids. Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems. Note that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module. This issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Guimard | Apache\ | < 1.3.19, \ |
Related Weaknesses (CWE)
References
- https://github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776ePatch
- https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changesRelease Notes
- https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMAProduct
- https://www.cve.org/CVERecord?id=CVE-2025-40931Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2025-40932Third Party Advisory
FAQ
What is CVE-2026-8503?
CVE-2026-8503 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids. Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator ret...
How severe is CVE-2026-8503?
CVE-2026-8503 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-8503?
Check the references section above for vendor advisories and patch information. Affected products include: Guimard Apache\.