CVE-2006-4433

What it is

PHP before 4.4.3 and 5.x before 5.1.4 does not limit the character set of the session identifier (PHPSESSID) for third party session handlers, which might make it easier for remote attackers to exploit other vulnerabilities by inserting PHP code into the PHPSESSID, which is stored in the session file. NOTE: it could be argued that this not a vulnerability in PHP itself, rather a design limitation that enables certain attacks against session handlers that do not account for this limitation.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

1.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2006-08-29 00:04 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:29 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.8% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2006-08-29 00:04 UTC

Last modified

2026-06-16 22:29 UTC

Exploit probability

1.8% · EPSS, next 30 days

Record status

Modified

Affected

• PHP 4.0
• PHP 4.0.0
• PHP 4.0.1
• PHP 4.0.2
• PHP 4.0.3
• PHP 4.0.4
• PHP 4.0.5
• PHP 4.0.6

Attack profile CVSS 2.0 · 7.5

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

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-2006-4433.md and follow it. Check whether this project is affected by CVE-2006-4433. 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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