CVE-2025-66301

CRITICALNVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.6 under NVD CVSS v3. EPSS exploit probability: 1.4%, top 31% 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
Weaponized
9.6EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, ssvc poc, public exploit)
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.6Exploit: Metasploit · ssvc poc · public exploitExposed: 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 1.8.0-beta.27, due to improper authorization checks when modifying critical fields on a POST request to /admin/pages/{page_name}, an editor with only permissions to change basic content on the form is now able to change the functioning of the form through modifying the content of the data[_json][header][form] which is the YAML frontmatter which includes the process section which dictates what happens after a user submits the form which include some important actions that could lead to further vulnerabilities. This vulnerability is fixed in 1.8.0-beta.27.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
84(Attend)
EG Risk 84/100SSVC: 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
Severity96% × 45%
Exploitation65% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
70%
KEV
Not listed

Published

December 1, 2025

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Broken Access Control allows Editor to modify the page's YAML Frontmatter to alter form processing actions · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-v8x2-fjv7-8hjh

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
getgrav/grav0.8.0 ... 1.8.0-beta.9 (311 versions)1.8.0-beta.27—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 27× 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 146 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-17 19:30 UTCEPSS rescore
  3. 2026-09-16 14:07 UTCEPSS rescore
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  7. 2026-09-12 08:53 UTCOSV refresh
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  24. 2026-08-24 14:02 UTCOSV refresh
  25. 2026-08-23 00:18 UTCEPSS rescore
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  1. 2026-08-21 23:48 UTCEPSS rescore
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  17. 2026-08-08 09:00 UTCEG score recompute
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  27. 2026-07-30 16:27 UTCEPSS rescore
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  36. 2026-07-23 14:41 UTCOSV refresh
  37. 2026-07-23 14:18 UTCEPSS rescore
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  39. 2026-07-23 03:01 UTCEG score recompute
  40. 2026-07-22 14:08 UTCEPSS rescore
  41. 2026-07-21 15:24 UTCEPSS rescore
  42. 2026-07-20 17:08 UTCEPSS rescore
  43. 2026-07-19 14:30 UTCEPSS rescore
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  45. 2026-07-19 02:28 UTCEPSS rescore
  46. 2026-07-18 10:04 UTCEPSS rescore
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  48. 2026-07-16 17:02 UTCEPSS rescore
  49. 2026-07-15 16:57 UTCEPSS rescore
  50. 2026-07-15 16:57 UTCEPSS rescore
  51. 2026-07-15 01:59 UTCEPSS rescore
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  53. 2026-07-13 22:29 UTCEPSS rescore
  54. 2026-07-13 06:12 UTCEPSS rescore
  55. 2026-07-12 05:46 UTCEPSS rescore
  56. 2026-07-11 08:27 UTCEPSS rescore
  57. 2026-07-09 19:09 UTCEPSS rescore
  58. 2026-07-08 15:15 UTCEPSS rescore
  59. 2026-07-07 13:46 UTCEPSS rescore
  60. 2026-07-06 16:27 UTCEPSS rescore
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  62. 2026-07-06 09:11 UTCOSV refresh
  63. 2026-07-06 02:23 UTCEPSS rescore
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  69. 2026-07-01 15:06 UTCEPSS rescore
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  71. 2026-06-30 23:22 UTCEPSS rescore
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  74. 2026-06-28 14:07 UTCEPSS rescore
  75. 2026-06-28 14:07 UTCEPSS rescore

Publicly available exploits

(1 reference)

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

  • Metasploitexploit/multi/http/grav_twig_ssti_sandbox_bypass_rce✓ verified
    First seen Dec 1, 2025

    Grav CMS Twig SSTI Authenticated Sandbox Bypass RCE

    Open source ↗

Frequently asked(5)

What is CVE-2025-66301?
CVE-2025-66301 is a critical vulnerability published on December 1, 2025. Grav is a file-based Web platform. Prior to 1.8.0-beta.27, due to improper authorization checks when modifying critical fields on a POST request to /admin/pages/{pagename}, an editor with only permissions to change basic content on the form is now able to change the functioning of the form through…
When was CVE-2025-66301 disclosed?
CVE-2025-66301 was first published in the National Vulnerability Database on December 1, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-66301 actively exploited?
CVE-2025-66301 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 30.1% of all scored CVEs.
What is the CVSS score of CVE-2025-66301?
CVE-2025-66301 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2025-66301?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66301, 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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