Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when FORM authentication is used, allows remote attackers to enumerate valid usernames via requests to /jsecuritycheck with malformed URL encoding of passwords, related to improper error checking in the (1) MemoryRealm, (2) DataSourceRealm, and (3) JDBCRealm authentication realms, as demonstrated by a % (percent) value for the j_password parameter.
{ "nvd_published_at": "2009-06-05T16:00:00Z", "cwe_ids": [ "CWE-200" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2022-06-17T00:37:06Z" }