CVE-2026-42609

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 61% 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
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: Elevated riskExposed: 0

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

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

May 11, 2026

Last Modified

May 14, 2026

Advisory Details (4)

Auto-updated May 11, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8
generic

Security fixes: FormFlash traversal, salt leak, user-overwrite hardening · getgrav/grav@d904efc · GitHub

https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632
generic

Security fixes: cache + serialization integrity, git-clone shell escape · getgrav/grav@c66dfeb · GitHub

https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47
generic

Security fixes: XSS detection, SVG XXE, Zip Slip, media attribute · getgrav/grav@5a12f9b · GitHub

https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
getgrav/grav0.8.0 ... 2.0.0-beta.1 (317 versions)2.0.0-beta.2—

Weakness Classification(4)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 42× 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 131 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-23 18:40 UTCEG score recompute
  3. 2026-08-23 00:19 UTCEPSS rescore
  4. 2026-08-21 23:49 UTCEPSS rescore
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  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-18 13:48 UTCEPSS rescore
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  9. 2026-08-17 11:15 UTCEG score recompute
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  11. 2026-08-16 04:27 UTCEG score recompute
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  20. 2026-08-11 01:12 UTCEG score recompute
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  22. 2026-08-09 14:25 UTCEG score recompute
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  24. 2026-08-09 02:16 UTCEG score recompute
  25. 2026-08-08 16:37 UTCEPSS rescore
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  1. 2026-08-08 01:58 UTCEG score recompute
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  3. 2026-08-06 13:46 UTCEPSS rescore
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  5. 2026-08-05 19:17 UTCEPSS rescore
  6. 2026-08-04 15:10 UTCEPSS rescore
  7. 2026-08-04 10:38 UTCEPSS rescore
  8. 2026-08-03 19:27 UTCEG score recompute
  9. 2026-08-03 10:36 UTCEPSS rescore
  10. 2026-08-02 14:23 UTCEG score recompute
  11. 2026-08-02 02:27 UTCEPSS rescore
  12. 2026-08-02 02:13 UTCEG score recompute
  13. 2026-08-01 04:16 UTCEPSS rescore
  14. 2026-07-30 16:28 UTCEPSS rescore
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  20. 2026-07-25 14:18 UTCEPSS rescore
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  22. 2026-07-23 14:18 UTCEPSS rescore
  23. 2026-07-23 03:11 UTCEG score recompute
  24. 2026-07-22 14:08 UTCEPSS rescore
  25. 2026-07-21 15:24 UTCEPSS rescore
  26. 2026-07-20 17:08 UTCEPSS rescore
  27. 2026-07-19 14:31 UTCEPSS rescore
  28. 2026-07-19 02:29 UTCEPSS rescore
  29. 2026-07-18 10:04 UTCEPSS rescore
  30. 2026-07-16 17:03 UTCEPSS rescore
  31. 2026-07-16 03:23 UTCOSV refresh
  32. 2026-07-15 16:57 UTCEPSS rescore
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  38. 2026-07-09 19:10 UTCEPSS rescore
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  40. 2026-07-07 13:46 UTCEPSS rescore
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  48. 2026-06-30 23:22 UTCEPSS rescore
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  50. 2026-06-28 14:07 UTCEPSS rescore
  51. 2026-06-28 04:56 UTCEPSS rescore
  52. 2026-06-27 03:08 UTCEPSS rescore
  53. 2026-06-25 13:49 UTCEPSS rescore
  54. 2026-06-25 13:49 UTCEPSS rescore
  55. 2026-06-24 14:05 UTCEPSS rescore
  56. 2026-06-23 21:33 UTCEPSS rescore
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  59. 2026-06-21 14:56 UTCEPSS rescore
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  67. 2026-06-15 17:49 UTCEPSS rescore
  68. 2026-06-13 23:00 UTCEPSS rescore
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  72. 2026-06-10 22:18 UTCEPSS rescore
  73. 2026-06-10 13:22 UTCEPSS rescore
  74. 2026-06-10 13:22 UTCEPSS rescore
  75. 2026-06-08 14:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-42609?
CVE-2026-42609 is a high vulnerability published on May 11, 2026. Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that…
When was CVE-2026-42609 disclosed?
CVE-2026-42609 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on May 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42609 actively exploited?
CVE-2026-42609 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 61.9% of all scored CVEs.
What is the CVSS score of CVE-2026-42609?
CVE-2026-42609 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-42609?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42609, 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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