CVE-2026-47838

Unauthorized User Impersonation when Using X.509 Client Certificates

HIGH

8.1

CVSS Score

Published: June 9, 2026 at 11:50 PM UTC

Updated: July 23, 2026 at 07:32 PM UTC

2 products affected across 2 vendorsSpring SecuritySpring Security

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Severity

HIGH8.1

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

Description

SubjectDnX509PrincipalExtractor 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. Affected versions: Spring Security 5.7.0 through 5.7.24; 5.8.0 through 5.8.26; 6.3.0 through 6.3.17; 6.4.0 through 6.4.17; 6.5.0 through 6.5.10.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Spring Security · VMware

95%

v < 5.7.255.8.0 ≤ v < 5.8.276.3.0 ≤ v < 6.3.186.4.0 ≤ v < 6.4.186.5.0 ≤ v < 6.5.11

Affected range stops below 5.7.25, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.8.27, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.3.18, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.4.18, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.5.11, so it looks safe — our inference, not a vendor statement

Spring Security · Spring

60%

5.7.0 ≤ v < 5.7.255.8.0 ≤ v < 5.8.276.3.0 ≤ v < 6.3.186.4.0 ≤ v < 6.4.186.5.0 ≤ v < 6.5.10.25.7.0 5.8.0 6.3.0 6.4.0 6.5.0

Affected range stops below 5.7.25, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.8.27, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.3.18, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.4.18, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.5.10.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://spring.io/security/cve-2026-47838

References (1)

Vendor Advisory

Source: cverecord

https://spring.io/security/cve-2026-47838

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-287

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