GHSA-4wj4-79rr-pvff

Source

https://github.com/advisories/GHSA-4wj4-79rr-pvff

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-4wj4-79rr-pvff/GHSA-4wj4-79rr-pvff.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-4wj4-79rr-pvff

Withdrawn

2026-09-16T22:14:36Z

Published

2026-07-08T15:32:01Z

Modified

2026-09-16T22:30:08Z

Severity

4.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
4.8 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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 CVSS Calculator

Summary

Duplicate Advisory: Grav: Stored CSS injection via Markdown image resize() bypasses prior media style sanitizers in Grav

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-ffmg-hfvg-jhg9. This link is maintained to preserve external references.

Original Description

Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action. Prior media hardening rejects direct ?style= payloads and unsafe attribute() fallbacks, but the resize() action in Excerpts::processMediaActions() writes caller-controlled values directly into the image's styleAttributes. A lower-privileged content editor who can edit page Markdown can store a crafted image URL with semicolon-delimited CSS declarations in the resize parameters, which are rendered into the final attribute when a higher-privileged reviewer/admin views the page or preview. This does not require JavaScript execution but enables UI redress/overlay and content-manipulation attacks (e.g., a full-viewport fixed overlay). Fixed in 2.0.0.

Database specific

{
    "cwe_ids": [
        "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-16T22:14:36Z",
    "nvd_published_at": "2026-07-08T14:17:20Z",
    "severity": "MODERATE"
}

References

Affected packages

Packagist / getgrav/grav

Package

Name: getgrav/grav
Purl: pkg:composer/getgrav/grav

Affected ranges

Affected versions

2.*

2.0.0-rc.9

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-4wj4-79rr-pvff/GHSA-4wj4-79rr-pvff.json"