{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.0.0-rc.9"
              },
              {
                "fixed": "2.0.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "e03d29aa0d3ece16d73c1ffccfa78df8bf5f28b8"
            },
            {
              "fixed": "bb4022f44b882ca4615188f4da5a0d646cef02ce"
            }
          ],
          "repo": "https://github.com/getgrav/grav",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-ffmg-hfvg-jhg9"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58657.json"
  },
  "details": "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 \u003cimg style=...\u003e 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.",
  "id": "CVE-2026-58657",
  "modified": "2026-07-15T01:49:08.023469586Z",
  "published": "2026-07-08T13:49:12.183Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58657.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-ffmg-hfvg-jhg9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58657"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/grav-stored-css-injection-via-markdown-image-resize-action"
    },
    {
      "type": "FIX",
      "url": "https://github.com/getgrav/grav/commit/6582166173bb8eb5869d96aea384e0e73777c94c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/getgrav/grav/commit/e03d29aa0d3ece16d73c1ffccfa78df8bf5f28b8"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Grav - Stored CSS Injection via Markdown Image resize() Action"
}