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 63% 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
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 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)
EPSS
37.0%
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 9× in last 7d / 46× 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 104 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
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  7. 2026-07-06 02:23 UTCEPSS rescore
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  16. 2026-06-28 03:25 UTCEG score recompute
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  21. 2026-06-25 13:49 UTCEPSS rescore
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  24. 2026-06-23 21:33 UTCEPSS rescore
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  1. 2026-06-22 14:25 UTCEPSS rescore
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  5. 2026-06-19 19:25 UTCEPSS rescore
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  9. 2026-06-17 01:05 UTCEG score recompute
  10. 2026-06-16 17:52 UTCEPSS rescore
  11. 2026-06-16 07:29 UTCEG score recompute
  12. 2026-06-15 17:49 UTCEPSS rescore
  13. 2026-06-15 02:44 UTCEG score recompute
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  20. 2026-06-12 11:27 UTCEG score recompute
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  22. 2026-06-11 14:00 UTCEPSS rescore
  23. 2026-06-11 11:06 UTCEG score recompute
  24. 2026-06-10 22:55 UTCEG score recompute
  25. 2026-06-10 22:18 UTCEPSS rescore
  26. 2026-06-10 13:22 UTCEPSS rescore
  27. 2026-06-10 13:22 UTCEPSS rescore
  28. 2026-06-10 10:45 UTCEG score recompute
  29. 2026-06-09 22:35 UTCEG score recompute
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  32. 2026-06-08 14:17 UTCEPSS rescore
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  34. 2026-06-08 09:31 UTCEG score recompute
  35. 2026-06-07 21:22 UTCEG score recompute
  36. 2026-06-07 15:25 UTCEPSS rescore
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  38. 2026-06-07 09:12 UTCEG score recompute
  39. 2026-06-06 21:03 UTCEG score recompute
  40. 2026-06-06 13:47 UTCEPSS rescore
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  42. 2026-06-06 08:52 UTCEG score recompute
  43. 2026-06-05 22:47 UTCEPSS rescore
  44. 2026-06-05 20:42 UTCEG score recompute
  45. 2026-06-05 08:33 UTCEG score recompute
  46. 2026-06-05 06:10 UTCEPSS rescore
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  48. 2026-06-04 20:23 UTCEG score recompute
  49. 2026-06-04 13:12 UTCEPSS rescore
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  51. 2026-06-04 08:13 UTCEG score recompute
  52. 2026-06-03 19:57 UTCEG score recompute
  53. 2026-06-03 07:47 UTCEG score recompute
  54. 2026-06-02 20:13 UTCEPSS rescore
  55. 2026-06-02 19:38 UTCEG score recompute
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  58. 2026-06-01 13:52 UTCEPSS rescore
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  60. 2026-06-01 07:06 UTCEG score recompute
  61. 2026-05-31 22:30 UTCEPSS rescore
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  63. 2026-05-31 00:16 UTCEPSS rescore
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  65. 2026-05-29 13:44 UTCEPSS rescore
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  71. 2026-05-26 13:44 UTCEPSS rescore
  72. 2026-05-26 07:18 UTCEPSS rescore
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  74. 2026-05-23 00:07 UTCEG score recompute
  75. 2026-05-20 22:38 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 37.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

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