# CVE-2026-86674: ningzichun Student Management System session fixation in login

Source: https://junglewise.ai/threats/cve-2026-86674-ningzichun-student-management-system-session-fixation-in-login  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-86674 · Severity: medium · CVSS 6.3 · Published 2026-09-08

The Student Management System's login handler fails to regenerate session identifiers after successful authentication. An attacker who can set a session ID before a victim logs in can reuse that same ID afterward to hijack the victim's authenticated session and gain unauthorized access to their account, including administrator accounts.

## Quick answers

**Is CVE-2026-86674 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86674 being exploited in the wild.

**How severe is CVE-2026-86674?** Medium severity, with a CVSS score of 6.3, published 8 September 2026.

**Which products and versions are affected?** ningzichun Student Management System up to commit 98760f5711cf6dc8b4adca53a9e207ca49b02ebf (versioning not used).

**Is there a fix for CVE-2026-86674?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-86674 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-86674?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a session fixation flaw in the login.php file's session handling. The vulnerable code calls session_start() and sets SESSION variables for login and user/admin roles, but never invokes session_regenerate_id(true) to rotate the session identifier after successful authentication. The attack requires a PHP configuration with session.use_strict_mode disabled (the default in some deployments), allowing an attacker to supply an arbitrary session ID via PHPSESSID cookie. An attacker can set a known session ID before the victim authenticates, then reuse that ID post-login to access the victim's authenticated session. The application does not use versioning, and the vendor has not yet responded to the early disclosure report.

## Affected products

- ningzichun Student Management System up to commit 98760f5711cf6dc8b4adca53a9e207ca49b02ebf (versioning not used)

## Timeline

- 2026-07-29: disclosed: Issue #16 opened on GitHub
- 2026-09-08: advisory: CVE-2026-86674 published

## References

- [https://github.com/ningzichun/student-management-system/issues/16](https://github.com/ningzichun/student-management-system/issues/16)
- [https://vuldb.com/cve/CVE-2026-86674](https://vuldb.com/cve/CVE-2026-86674)