CVE-2026-42845

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Source

https://cve.org/CVERecord?id=CVE-2026-42845

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42845.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-42845

Aliases

GHSA-w4rc-p66m-x6qq

Published

2026-05-11T15:44:35.524Z

Modified

2026-07-08T08:12:35.242622226Z

Severity

7.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P CVSS Calculator

Summary

Grav: Anonymous Page Content Overwrite via Form File Upload filename Override

Details

The form plugin for Grav adds the ability to create and use forms. Prior to 9.1.0 , there is an unauthenticated page-content overwrite via file upload (GHSA-w4rc-p66m-x6qq). Public form uploads now strip path components from the POST-supplied filename and hard-block page-content extensions (md, yaml, yml, json, twig, ini) regardless of the configurable dangerous-extensions list. A permissive accept policy combined with the default destination: self@ could otherwise let an attacker overwrite the page's own .md and pivot to super-admin via a process: save action. This vulnerability is fixed in 9.1.0.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42845.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-73"
    ]
}

References

Affected packages

Git / github.com/getgrav/grav-plugin-form

Affected ranges

Type

GIT

Repo

https://github.com/getgrav/grav-plugin-form

Events

Introduced

Fixed

48bacc4187e1cff815000e526d5ca2878484867f

Database specific

{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "9.1.0"
        }
    ]
}

Affected versions

0.*

0.7.0

1.*

1.3.0-beta.1

1.3.0-beta.2

1.3.0-beta.3

1.3.0-beta.4

1.3.0-beta.6

1.3.0-rc.1

1.3.0-rc.2

1.3.0-rc.3

1.3.0-rc.4

2.*

2.0.0-rc.1

2.0.8-rc.1

2.8.0-rc.1

2.8.0-rc.2

3.*

3.0.0-beta.1

3.0.0-beta.2

3.0.0-beta.3

3.0.0-beta.4

3.0.0-beta.5

3.0.0-rc.1

3.0.0-rc.2

3.0.0-rc.3

3.0.0-rc.4

4.*

4.0.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42845.json"