CVE-2009-3890

What it is

Unrestricted file upload vulnerability in the wp_check_filetype function in wp-includes/functions.php in WordPress before 2.8.6, when a certain configuration of the mod_mime module in the Apache HTTP Server is enabled, allows remote authenticated users to execute arbitrary code by posting an attachment with a multiple-extension filename, and then accessing this attachment via a direct request to a wp-content/uploads/ pathname, as demonstrated by a .php.jpg filename.

At a glance

Exploitability

Can be exploited over the network with a login. Limited direct impact.

Exploit odds

8.7% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2009-11-17 18:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:12 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 8.7% in the next 30 days (EPSS).
• Severity: 6.0 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2009-11-17 18:30 UTC

Last modified

2026-06-16 23:12 UTC

Exploit probability

8.7% · EPSS, next 30 days

Weakness

CWE-94 · Code injection

Record status

Modified

Affected

• WordPress ≤ 2.8.5

Attack profile CVSS 2.0 · 6.0

Attack vector

Network

Complexity

Medium

Authentication

Single

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-2009-3890.md and follow it. Check whether this project is affected by CVE-2009-3890. 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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