CVE-2026-75627

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Bastillion fails to properly validate request URI paths in its controller dispatcher, allowing unauthenticated attackers to bypass authentication filters by prefixing requests with arbitrary path segments. Attackers can access administrative controllers to read user listings, create manager accounts, and register managed systems, gaining control over SSH access to the managed fleet.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 18, 2026

Advisory Details (5)

Auto-updated Aug 18, 2026
Patch available. Sources: github_commit.
generic

Unauthenticated admin bypass in Bastillion via path-prefix routing mismatch · Issue #669 · bastillion-io/Bastillion · GitHub

https://github.com/bastillion-io/Bastillion/issues/669
generic

Bastillion Authentication Bypass via Path-Prefix Routing Mismatch | Advisories | VulnCheck

https://www.vulncheck.com/advisories/bastillion-authentication-bypass-via-path-prefix-routing-mismatch
github_commit Patch Available

commit d759fb686a1a (bastillion-io/Bastillion)

Patch available: bastillion-io/Bastillion v5.2.0 (contains commit d759fb686a1a)

https://github.com/bastillion-io/Bastillion/commit/d759fb686a1a097b1b026e286fd9b20e5ba349c8
generic

Bastillion/src/main/java/loophole/mvc/base/BaseKontroller.java at main · bastillion-io/Bastillion · GitHub

https://github.com/bastillion-io/Bastillion/blob/master/src/main/java/loophole/mvc/base/BaseKontroller.java
generic

GitHub - bastillion-io/Bastillion: Bastillion gives you a clean, browser-based way to manage SSH access across all your systems—like a bastion host with a friendly dashboard. · GitHub

https://github.com/bastillion-io/Bastillion

Vendor Advisories for CVE-2026-75627(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 28× in last 7d / 28× 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. 2026-08-21 07:32 UTCGHSA enrichment
  2. 2026-08-21 03:28 UTCGHSA enrichment
  3. 2026-08-20 23:24 UTCEG score recompute
  4. 2026-08-20 23:24 UTCGHSA enrichment
  5. 2026-08-20 22:56 UTCEPSS rescore
  6. 2026-08-20 19:21 UTCGHSA enrichment
  7. 2026-08-20 15:17 UTCGHSA enrichment
  8. 2026-08-20 11:12 UTCGHSA enrichment
  9. 2026-08-20 07:08 UTCGHSA enrichment
  10. 2026-08-20 03:04 UTCGHSA enrichment
  11. 2026-08-19 23:00 UTCGHSA enrichment
  12. 2026-08-19 18:56 UTCEG score recompute
  13. 2026-08-19 18:56 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 14:51 UTCGHSA enrichment
  16. 2026-08-19 10:47 UTCGHSA enrichment
  17. 2026-08-19 06:42 UTCGHSA enrichment
  18. 2026-08-19 02:34 UTCGHSA enrichment
  19. 2026-08-18 22:28 UTCGHSA enrichment
  20. 2026-08-18 18:25 UTCEG score recompute
  21. 2026-08-18 18:25 UTCGHSA enrichment
  22. 2026-08-18 18:15 UTCEG score recompute
  23. 2026-08-18 18:15 UTCGHSA enrichment
  24. 2026-08-18 15:34 UTCEG score recompute
  25. 2026-08-18 15:34 UTCGHSA enrichment
Show 3 more
  1. 2026-08-18 11:23 UTCEG score recompute
  2. 2026-08-18 10:55 UTCEG score recompute
  3. 2026-08-18 10:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-75627?
CVE-2026-75627 is a critical vulnerability published on August 18, 2026. Bastillion fails to properly validate request URI paths in its controller dispatcher, allowing unauthenticated attackers to bypass authentication filters by prefixing requests with arbitrary path segments. Attackers can access administrative controllers to read user listings, create manager…
When was CVE-2026-75627 disclosed?
CVE-2026-75627 was first published in the National Vulnerability Database on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75627 actively exploited?
CVE-2026-75627 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 62.9% of all scored CVEs.
What is the CVSS score of CVE-2026-75627?
CVE-2026-75627 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-75627?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75627, 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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