CVE-2011-4718

6.8 MEDIUM 4% exploit odds No fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 3.6% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2013-08-13 15:04 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:35 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.6% in the next 30 days (EPSS).
Severity: 6.8 MEDIUM (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2013-08-13 15:04 UTC
Last modified: 2026-06-16 23:35 UTC
Exploit probability: 3.6% · EPSS, next 30 days
Weakness: CWE-264
Record status: Modified

Affected

PHP ≤ 5.5.1
PHP 5.0.0
PHP 5.0.1
PHP 5.0.2
PHP 5.0.3
PHP 5.0.4
PHP 5.0.5
PHP 5.1.0

Attack profile CVSS 2.0 · 6.8

Attack vector: Network
Complexity: Medium
Authentication: None
Confidentiality: Partial
Integrity: Partial
Availability: Partial

Raw vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2011-4718.md and follow it. Check whether this project is affected by CVE-2011-4718. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record