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Fencer Vulns
medium 6.8

CVE-2026-47838 json

Unauthorized User Impersonation when Using X.509 Client Certificates

published 2026-06-09 5 mo ago modified 2026-09-10 1 mo ago also GHSA-293q-567p-wmwq , EUVD-2026-35911

cvss
6.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.springframework.security:spring-security-web 6.5.11
  • Spring Spring Security 5.7.25, 5.8.27, 6.3.18, 6.4.18, 6.5.10.2

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 6.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.springframework.security:spring-security-web
>=6.5.0, <6.5.11
>=6.4.0, <=6.4.13
>=6.0.0, <=6.3.10
>=5.8.0, <=5.8.16
<=5.7.14
6.5.11

Affected products

  • Spring Spring Security

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.