Vulnerability-Lookup

GHSA-M8GP-46R6-RC3F

Vulnerability from github – Published: 2026-07-15 12:32 – Updated: 2026-07-15 12:32

Details

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.

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

7.2 (High)


                  
                    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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-61873"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-73"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-15T12:18:22Z",
    "severity": "HIGH"
  },
  "details": "Grav before 9.1.8 contains an arbitrary file write vulnerability in the Form plugin\u0027s 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.",
  "id": "GHSA-m8gp-46r6-rc3f",
  "modified": "2026-07-15T12:32:05Z",
  "published": "2026-07-15T12:32:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-q532-mvx7-42qg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61873"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-twig-processed-filename"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-61873 (GCVE-0-2026-61873)

Vulnerability from cvelistv5 – Published: 2026-07-15 11:25 – Updated: 2026-07-15 18:00

Title

Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename

Summary

Severity

7.2 (High)


                        
                          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

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-73 - External Control of File Name or Path

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/getgrav/grav/security/advisori…	vendor-advisory
https://www.vulncheck.com/advisories/grav-before-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
getgrav	grav	Affected: 0 , < 9.1.8 (semver) Unaffected: 9.1.8 (semver)

Date Public

2026-06-26 00:00

Credits

alienkeric

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-61873",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-15T18:00:45.862571Z",
                "version": "2.0.3"
              },
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        },
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            "url": "https://github.com/getgrav/grav/security/advisories/GHSA-q532-mvx7-42qg"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
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          "product": "grav",
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              "status": "affected",
              "version": "0",
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            {
              "status": "unaffected",
              "version": "9.1.8",
              "versionType": "semver"
            }
          ]
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      ],
      "cpeApplicability": [],
      "credits": [
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          "type": "reporter",
          "value": "alienkeric"
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      ],
      "datePublic": "2026-06-26T00:00:00.000Z",
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        }
      ],
      "metrics": [
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            "privilegesRequired": "LOW",
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            "subConfidentialityImpact": "NONE",
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            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
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      },
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          "name": "GitHub Security Advisory (GHSA-q532-mvx7-42qg)",
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          ],
          "url": "https://github.com/getgrav/grav/security/advisories/GHSA-q532-mvx7-42qg"
        },
        {
          "name": "VulnCheck Advisory: Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-twig-processed-filename"
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      ],
      "title": "Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename",
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  "cveMetadata": {
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    "datePublished": "2026-07-15T11:25:56.100Z",
    "dateReserved": "2026-07-10T21:54:26.760Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-M8GP-46R6-RC3F

CVE-2026-61873 (GCVE-0-2026-61873)

Tags

Sightings

Nomenclature