CVE-2009-2335
CWE-16Published: July 10, 2009· Updated: Jun 16, 2026
Official Description
WordPress and WordPress MU before 2.8.1 exhibit different behavior for a failed login attempt depending on whether the user account exists, which allows remote attackers to enumerate valid usernames. NOTE: the vendor reportedly disputes the significance of this issue, indicating that the behavior exists for "user convenience."
Technical Analysis
CVE-2009-2335 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A proof-of-concept (PoC) exploit exists for CVE-2009-2335. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (22)
Quick Facts
Related CVEs (CWE-16)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2009-2335 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts