CVE-2026-42607

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 3.9%, top 11% 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
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 9.1Exploit: 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, an authenticated user with administrative privileges can achieve Remote Code Execution (RCE) by uploading a specially crafted ZIP file through the "Direct Install" tool. While the system attempts to block direct .php file uploads, it fails to inspect the contents of uploaded ZIP archives. Once a malicious plugin is extracted, it can execute arbitrary PHP code or drop a persistent web shell on the server. This vulnerability is fixed in 2.0.0-beta.2.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
89.2%
KEV
Not listed

Published

May 11, 2026

Last Modified

May 12, 2026

Advisory Details (2)

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

Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Feature · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-w48r-jppp-rcfw
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(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 57× 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 164 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
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  1. 2026-06-23 21:33 UTCEPSS rescore
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  9. 2026-06-17 05:31 UTCEG score recompute
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  26. 2026-06-12 23:12 UTCEPSS rescore
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  28. 2026-06-12 21:40 UTCEG score recompute
  29. 2026-06-12 17:58 UTCEG score recompute
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  36. 2026-06-11 14:00 UTCEPSS rescore
  37. 2026-06-11 11:43 UTCEG score recompute
  38. 2026-06-11 08:02 UTCEG score recompute
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  40. 2026-06-11 00:36 UTCEG score recompute
  41. 2026-06-10 22:18 UTCEPSS rescore
  42. 2026-06-10 20:54 UTCEG score recompute
  43. 2026-06-10 17:06 UTCEG score recompute
  44. 2026-06-10 13:24 UTCEG score recompute
  45. 2026-06-10 13:22 UTCEPSS rescore
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  47. 2026-06-10 09:42 UTCEG score recompute
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  49. 2026-06-10 02:17 UTCEG score recompute
  50. 2026-06-09 22:35 UTCEG score recompute
  51. 2026-06-09 18:46 UTCEG score recompute
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  53. 2026-06-09 11:22 UTCEG score recompute
  54. 2026-06-09 07:40 UTCEG score recompute
  55. 2026-06-09 03:52 UTCEG score recompute
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  57. 2026-06-08 20:27 UTCEG score recompute
  58. 2026-06-08 14:17 UTCEPSS rescore
  59. 2026-06-08 14:17 UTCEPSS rescore
  60. 2026-06-08 13:49 UTCEG score recompute
  61. 2026-06-08 10:06 UTCEG score recompute
  62. 2026-06-08 06:23 UTCEG score recompute
  63. 2026-06-08 02:42 UTCEG score recompute
  64. 2026-06-07 23:00 UTCEG score recompute
  65. 2026-06-07 19:18 UTCEG score recompute
  66. 2026-06-07 15:36 UTCEG score recompute
  67. 2026-06-07 15:25 UTCEPSS rescore
  68. 2026-06-07 15:25 UTCEPSS rescore
  69. 2026-06-07 11:54 UTCEG score recompute
  70. 2026-06-07 08:11 UTCEG score recompute
  71. 2026-06-07 04:29 UTCEG score recompute
  72. 2026-06-07 00:47 UTCEG score recompute
  73. 2026-06-06 21:05 UTCEG score recompute
  74. 2026-06-06 17:23 UTCEG score recompute
  75. 2026-06-06 13:47 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52578
    First seen May 26, 2026

    Grav CMS 2.0.0-beta.2 - Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42607?
CVE-2026-42607 is a critical vulnerability published on May 11, 2026. Grav is a file-based Web platform. Prior to 2.0.0-beta.2, an authenticated user with administrative privileges can achieve Remote Code Execution (RCE) by uploading a specially crafted ZIP file through the "Direct Install" tool. While the system attempts to block direct .php file uploads, it fails…
When was CVE-2026-42607 disclosed?
CVE-2026-42607 was first published in the National Vulnerability Database on May 11, 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-2026-42607 actively exploited?
CVE-2026-42607 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 89.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42607?
CVE-2026-42607 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-42607?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42607, 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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