CVE-2025-13473: Username enumeration through timing difference in mod_wsgi authentication handler

Vulnerability summary

CVE-2025-13473 is a medium (CVSS 5.3) Observable Timing Discrepancy vulnerability in djangoproject django. EPSS estimates a 0.80% chance of exploitation in the next 30 days, higher than 56.5% of scored vulnerabilities.

Timeline

1. 03-02-2026
   PublishedVulnerability first disclosed.
2. 03-02-2026
   Last modifiedVulnerability information updated.

Description

An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. The `django.contrib.auth.handlers.modwsgi.check_password()` function for authentication via `mod_wsgi` allows remote attackers to enumerate users via a timing attack. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Stackered for reporting this issue.

• CWE-208Observable Timing DiscrepancyTwo separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.