CVE-2026-40542 PUBLISHED

Apache HttpClient: SCRAM-SHA-256 mutual authentication bypass may cause the client to accept authentication without proper mutual authentication verification

Assigner: apache
Reserved: 14.04.2026 Published: 22.04.2026 Updated: 22.04.2026

Missing critical step in authentication in Apache HttpClient 5.6 allows an attacker to cause the client to accept SCRAM-SHA-256 authentication without proper mutual authentication verification. Users are recommended to upgrade to version 5.6.1, which fixes this issue.

Product Status

Vendor Apache Software Foundation
Product Apache HttpClient
Versions Default: unaffected
  • affected from 5.6 to 5.6.1 (excl.)

Credits

  • Rasmus Moorats finder

References

Problem Types

  • CWE-304: Missing Critical Step in Authentication CWE