CVE-2026-47838 json
Unauthorized User Impersonation when Using X.509 Client Certificates
published 5mo ago modified 2mo 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
Is CVE-2026-47838 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5mo ago
Exploit prediction
0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-11).
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
-
- CWE-287 Improper Authentication
- Technology feeds
References
-
spring.io
/security/cve-2026-47838
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-47838
advisory
-
github.com
/advisories/GHSA-2jrg-rf5x-568g
advisory
Sources
- CVE List CVE-2026-47838
- GitHub Advisory GHSA-293q-567p-wmwq
- NVD CVE-2026-47838
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