VDB
CVE-2026-40542
CVE-2026-40542
PUBLISHED
CVSS 7.300000190734863 HIGH
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.
EPSS 0.70% · 52.8th percentile
Risk Scores
CVSS 3.1
7.300000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS Score
0.70%
52.8th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HttpClient | 5.6 |
Timeline
- Apr 22, 2026 CVE Published
- Apr 22, 2026 PoC Published
- Apr 22, 2026 PoC Published
- Apr 23, 2026 Security Advisory
- Apr 29, 2026 CVE Updated
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score
- May 27, 2026 EPSS Score