CVE-2026-42205

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 79% 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, nvd
Elevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

Avo is a framework to create admin panels for Ruby on Rails apps. Prior to version 3.31.2, a broken access control vulnerability was identified in the ActionsController of the Avo framework. Due to insecure action lookup logic, an authenticated user can execute any Action class (descendants of Avo::BaseAction) on any resource, even if the action is not registered for that specific resource. This leads to Privilege Escalation and unauthorized data manipulation across the entire application. This issue has been patched in version 3.31.2.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
21.3%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 12, 2026

Advisory Details (2)

Auto-updated May 10, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Broken Access Control: Unauthorized Execution of Arbitrary Action Classes Across Resources · Advisory · avo-hq/avo · GitHub

https://github.com/avo-hq/avo/security/advisories/GHSA-qc5p-3mg5-9fh8
generic

Release Release v3.31.2 · avo-hq/avo · GitHub

https://github.com/avo-hq/avo/releases/tag/v3.31.2

Vendor Advisories for CVE-2026-42205(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)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
avo0.2.0 ... 3.9.2 (569 versions)3.31.2—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 44× 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 107 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
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  16. 2026-06-28 03:55 UTCEG score recompute
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  1. 2026-06-21 14:56 UTCEPSS rescore
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  19. 2026-06-12 21:23 UTCEG score recompute
  20. 2026-06-12 09:49 UTCEG score recompute
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  25. 2026-06-10 22:18 UTCEPSS rescore
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  28. 2026-06-10 11:33 UTCEG score recompute
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  36. 2026-06-07 15:25 UTCEPSS rescore
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  38. 2026-06-07 14:11 UTCEG score recompute
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  40. 2026-06-06 14:49 UTCEG score recompute
  41. 2026-06-06 13:47 UTCEPSS rescore
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  50. 2026-06-04 13:12 UTCEPSS rescore
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  52. 2026-06-04 04:59 UTCEG score recompute
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  59. 2026-06-01 13:52 UTCEPSS rescore
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  61. 2026-06-01 07:35 UTCEG score recompute
  62. 2026-05-31 22:30 UTCEPSS rescore
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  66. 2026-05-29 13:44 UTCEPSS rescore
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  74. 2026-05-26 13:44 UTCEPSS rescore
  75. 2026-05-26 07:18 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-42205?
CVE-2026-42205 is a high vulnerability published on May 8, 2026. Avo is a framework to create admin panels for Ruby on Rails apps. Prior to version 3.31.2, a broken access control vulnerability was identified in the ActionsController of the Avo framework. Due to insecure action lookup logic, an authenticated user can execute any Action class (descendants of…
When was CVE-2026-42205 disclosed?
CVE-2026-42205 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42205 actively exploited?
CVE-2026-42205 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42205?
CVE-2026-42205 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-42205?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42205, 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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