Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-293q-567p-wmwq
Advisory ID github_osv/GHSA-293q-567p-wmwq
Aliases CVE-2026-47838
Summary Spring Security Vulnerable to Unauthorized User Impersonation when Using X.509 Client Certificates In Spring Security Web, `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. `SubjectDnX509PrincipalExtractor` is deprecated by this CVE and replaced with `SubjectX500PrincipalExtractor`. As part of updating, you should also migrate to `SubjectX500PrincipalExtractor`. Affected versions: Spring Security Enterprise 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. OSS 6.5.0 through 6.5.10.
Status Published
Exploitability 0.5
Weighted Severity 6.1
Risk 3.0
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-287 Improper Authentication
System Score Found at
cvssv3.1 6.8 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-293q-567p-wmwq/GHSA-293q-567p-wmwq.json
generic_textual MODERATE
Reference id Reference type URL
https://spring.io/security/cve-2026-47838
spring-projects/spring-security
CVE-2026-47838 https://nvd.nist.gov/vuln/detail/CVE-2026-47838
GHSA-2jrg-rf5x-568g https://github.com/advisories/GHSA-2jrg-rf5x-568g
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-293q-567p-wmwq/GHSA-293q-567p-wmwq.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.