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Vulnerability record · CVE-2026-61873 · published 15 July 2026

CVE-2026-61873: Grav before 9.1.8 contains an arbitrary file write vulnerability in the Form plugin's process.save.filename pa…

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.

7.2 CVSS 4.0 High EPSS 0.46% · top 62.7% CWE-73 · CWE-73 Deferred
7.2CVSS 4.0 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
15 Jul 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/getgrav/grav/security/advisories/GHSA-q532-mvx7-42qg
https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-twig-processed-filename
https://github.com/getgrav/grav/security/advisories/GHSA-q532-mvx7-42qg

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Source: NIST National Vulnerability Database (record CVE-2026-61873), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.