CVE-2007-3799

What it is

The session_start function in ext/session in PHP 4.x up to 4.4.7 and 5.x up to 5.2.3 allows remote attackers to insert arbitrary attributes into the session cookie via special characters in a cookie that is obtained from (1) PATH_INFO, (2) the session_id function, and (3) the session_start function, which are not encoded or filtered when the new session cookie is generated, a related issue to CVE-2006-0207.

At a glance

Exploitability

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

Exploit odds

7.9% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2007-07-16 22:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:42 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 7.9% in the next 30 days (EPSS).
• Severity: 4.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2007-07-16 22:30 UTC

Last modified

2026-06-16 22:42 UTC

Exploit probability

7.9% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

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 · 4.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

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.

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