CVE-2026-15638

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

An unauthenticated user with access to Secret Server could leverage a padding oracle to decrypt or encrypt data using one of the server's cryptographic keys. The key itself is not exposed.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Delinea Security Advisories

https://delinea.com/security-advisories

Vendor Advisories for CVE-2026-15638(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 36× in last 7d / 36× 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. 2026-09-19 21:35 UTCGHSA enrichment
  2. 2026-09-19 17:17 UTCEG score recompute
  3. 2026-09-19 17:17 UTCGHSA enrichment
  4. 2026-09-19 12:59 UTCGHSA enrichment
  5. 2026-09-19 08:42 UTCGHSA enrichment
  6. 2026-09-19 04:23 UTCGHSA enrichment
  7. 2026-09-19 00:05 UTCGHSA enrichment
  8. 2026-09-18 19:48 UTCEG score recompute
  9. 2026-09-18 19:48 UTCGHSA enrichment
  10. 2026-09-18 19:27 UTCEPSS rescore
  11. 2026-09-18 16:58 UTCGHSA enrichment
  12. 2026-09-18 12:40 UTCGHSA enrichment
  13. 2026-09-18 08:22 UTCGHSA enrichment
  14. 2026-09-18 04:05 UTCGHSA enrichment
  15. 2026-09-17 23:45 UTCEG score recompute
  16. 2026-09-17 23:45 UTCGHSA enrichment
  17. 2026-09-17 18:41 UTCGHSA enrichment
  18. 2026-09-17 14:20 UTCGHSA enrichment
  19. 2026-09-17 10:01 UTCGHSA enrichment
  20. 2026-09-17 05:42 UTCGHSA enrichment
  21. 2026-09-17 01:21 UTCGHSA enrichment
  22. 2026-09-16 21:02 UTCEG score recompute
  23. 2026-09-16 21:02 UTCGHSA enrichment
  24. 2026-09-16 19:44 UTCEG score recompute
  25. 2026-09-16 19:44 UTCGHSA enrichment
Show 11 more
  1. 2026-09-16 18:32 UTCGHSA enrichment
  2. 2026-09-16 14:14 UTCEG score recompute
  3. 2026-09-16 14:14 UTCGHSA enrichment
  4. 2026-09-16 14:07 UTCEPSS rescore
  5. 2026-09-16 09:56 UTCGHSA enrichment
  6. 2026-09-16 05:37 UTCGHSA enrichment
  7. 2026-09-16 01:20 UTCEG score recompute
  8. 2026-09-16 01:20 UTCGHSA enrichment
  9. 2026-09-16 00:25 UTCEG score recompute
  10. 2026-09-15 23:33 UTCEG score recompute
  11. 2026-09-15 23:32 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-15638?
CVE-2026-15638 is a critical vulnerability published on September 15, 2026. An unauthenticated user with access to Secret Server could leverage a padding oracle to decrypt or encrypt data using one of the server's cryptographic keys. The key itself is not exposed.
When was CVE-2026-15638 disclosed?
CVE-2026-15638 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15638 actively exploited?
CVE-2026-15638 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 89.6% of all scored CVEs.
What is the CVSS score of CVE-2026-15638?
CVE-2026-15638 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-15638?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15638, 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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