Unauthorized User Impersonation when Using X.509 Client Certificates (CVE-2026-22747) | HOL Guard CVE

Medium · CVSS 6.8CVE-2026-22747

Unauthorized User Impersonation when Using X.509 Client Certificates

Answer in brief

CVE-2026-22747 records a Medium severity (CVSS 6.8) vulnerability in Unauthorized User Impersonation when Using X.509 Client Certificates. The current sources do not mark it as known exploited. The current feed maps Spring/Spring Security (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 22, 2026Updated Jul 15, 2026Source checked Sep 19, 2026First seen by HOL Jul 15, 2026Material review Jul 15, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Spring/Spring Security (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Spring/Spring Securitygeneric	7.0.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Spring/Spring Security.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Apr 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 15, 2026

Sources and claim methodology

Upstream source description

Vulnerability in Spring Spring Security. SubjectX500PrincipalExtractor does not correctly handle certain malformed X.509 certificate CN values, which can lead to reading the wrong value for the username. In a carefully crafted certificate, this can lead to an attacker impersonating another user. This issue affects Spring Security: from 7.0.0 through 7.0.4.

Quoted source text, attributed separately from HOL analysis.