CVE-2026-59354

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 70% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In versions of Spring Security's OAuth2 Authorization Server module 7.0.0 through 7.0.4, when Dynamic Client Registration is explicitly enabled, the registration endpoint performs insufficient validation of certain client metadata fields supplied by the registering client. An attacker who possesses a valid Initial Access Token can register a malicious client with crafted metadata, which, depending on server configuration and how the metadata is later rendered or used, may result in Stored Cross-Site Scripting (XSS), Privilege Escalation, or Server-Side Request Forgery (SSRF).

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

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
Severity96% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
No patch confirmed yet.
generic

Spring Security Authorization Server Dynamic Client Registration endpoints perform insufficient validation of client metadata

https://spring.io/security/cve-2026-59354

Vendor Advisories for CVE-2026-59354(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 31× in last 7d / 31× 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.

  1. 2026-08-30 03:07 UTCEG score recompute
  2. 2026-08-30 03:07 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 23:15 UTCGHSA enrichment
  5. 2026-08-29 19:23 UTCGHSA enrichment
  6. 2026-08-29 15:30 UTCGHSA enrichment
  7. 2026-08-29 11:39 UTCGHSA enrichment
  8. 2026-08-29 07:45 UTCGHSA enrichment
  9. 2026-08-29 03:51 UTCGHSA enrichment
  10. 2026-08-28 23:57 UTCEG score recompute
  11. 2026-08-28 23:57 UTCGHSA enrichment
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-28 19:04 UTCGHSA enrichment
  14. 2026-08-28 17:08 UTCGHSA enrichment
  15. 2026-08-28 13:14 UTCGHSA enrichment
  16. 2026-08-28 09:21 UTCGHSA enrichment
  17. 2026-08-28 05:27 UTCEG score recompute
  18. 2026-08-28 05:26 UTCGHSA enrichment
  19. 2026-08-28 04:59 UTCEG score recompute
  20. 2026-08-28 04:59 UTCGHSA enrichment
  21. 2026-08-28 01:14 UTCGHSA enrichment
  22. 2026-08-27 21:19 UTCGHSA enrichment
  23. 2026-08-27 17:27 UTCEG score recompute
  24. 2026-08-27 17:27 UTCGHSA enrichment
  25. 2026-08-27 14:25 UTCEPSS rescore
Show 6 more
  1. 2026-08-27 13:33 UTCEG score recompute▲ 3.50
  2. 2026-08-27 13:33 UTCGHSA enrichment
  3. 2026-08-27 13:31 UTCNVD updateCVSS v3 → 9.6 · severity → CRITICAL
  4. 2026-08-27 10:27 UTCEG score recompute
  5. 2026-08-27 09:24 UTCEG score recompute
  6. 2026-08-27 09:23 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59354?
CVE-2026-59354 is a critical vulnerability published on August 27, 2026. In versions of Spring Security's OAuth2 Authorization Server module 7.0.0 through 7.0.4, when Dynamic Client Registration is explicitly enabled, the registration endpoint performs insufficient validation of certain client metadata fields supplied by the registering client. An attacker who possesses…
When was CVE-2026-59354 disclosed?
CVE-2026-59354 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59354 actively exploited?
CVE-2026-59354 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.8% of all scored CVEs.
What is the CVSS score of CVE-2026-59354?
CVE-2026-59354 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-59354?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59354, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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