PatchTheCVECVE-2026-42607: Grav is a file-based Web platform
CVE-2026-42607 is a critical-severity flaw (CVSS 9.1) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- Critical severity
- EPSS top 10%: very likely to be exploited
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.1 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | High |
| User interaction | None |
| EPSS exploit chance | 3.9% (top 10%) |
| CISA exploited list | No |
| Weakness | CWE-94 |
| Published | 2026-05-11 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Write-up: github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663
- Write-up: github.com/getgrav/grav/security/advisories/GHSA-w48r-jppp-rcfw
- Exploit-DB: Grav CMS 2.0.0-beta.2 - Remote Code Execution
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-42607?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-42607 being exploited?
CVE-2026-42607 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-42607 affect?
CVE-2026-42607 affects affected software. Severity is critical (CVSS 9.1). 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 sy
How urgent is CVE-2026-42607?
Priority 59/100. Critical severity; EPSS top 10%: very likely to be exploited; Public exploit reference