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CVE-2009-2335

MediumPublished

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...

Published: Jul 10, 2009
Updated: Aug 7, 2024
Assigning CNA: mitre
Evidence observed: Aug 20, 2011

Primary CVSS

5.0/ 10Medium

nvd · CVSS 2.0

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

EPSS probability estimate

85.0%

High · next 30 days

Percentile: 99.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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."

Sources

WordPress Plugin Block-Spam-By-Math-Reloaded - BypassExploit
Tiago Ferreira & Heyder Andrade · php · Aug 20, 2011

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