CVE-2026-61873
Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
Grav before 9.1.8 contains an arbitrary file write vulnerability in the Form plugin's process.save.filename parameter, which is validated against path traversal before Twig processing but never re-validated after rendering. Attackers can submit form data containing path traversal sequences that are processed through Twig templates, allowing them to write arbitrary files including PHP webshells to the web root or other sensitive directories.
| CWE | CWE-73 |
| Vendor | getgrav |
| Product | grav |
| Published | Jul 15, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected Versions
getgrav / grav
0 < 9.1.8
References
Credits
🔍 alienkeric