CVE-2026-47838

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 97% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

Published

June 10, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Jun 13, 2026
Patch available.
generic

CVE-2026-47838: Unauthorized User Impersonation when Using X.509 Client Certificates

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

Vendor Advisories for CVE-2026-47838(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.springframework.security:spring-security-web3.0.0.RELEASE ... 5.7.9 (173 versions)
  • 6.5.0 up to 6.5.11: fixed in 6.5.11
  • 6.4.0 through 6.4.13: no fix on record
  • 6.0.0 through 6.3.10: no fix on record
  • 5.8.0 through 5.8.16: no fix on record
  • every version through 5.7.14: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 158 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
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  20. 2026-09-14 04:19 UTCEG score recompute
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  1. 2026-09-04 05:06 UTCEPSS rescore
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  5. 2026-08-30 19:17 UTCEPSS rescore
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  11. 2026-08-25 00:30 UTCEG score recompute
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  27. 2026-08-13 22:18 UTCEG score recompute
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  31. 2026-08-11 16:40 UTCEG score recompute
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  38. 2026-08-07 23:13 UTCEG score recompute
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  62. 2026-07-23 03:17 UTCEG score recompute▲ 1.30
  63. 2026-07-22 14:08 UTCEPSS rescore
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  75. 2026-07-11 08:27 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-47838?
CVE-2026-47838 is a high vulnerability published on June 10, 2026. 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…
When was CVE-2026-47838 disclosed?
CVE-2026-47838 was first published on June 10, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47838 actively exploited?
CVE-2026-47838 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-47838?
CVE-2026-47838 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-47838?
A fix for CVE-2026-47838 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-47838 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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