FKIE_CVE-2026-54298

Vulnerability from fkie_nvd - Published: 2026-06-22 19:17 - Updated: 2026-06-23 17:17
Severity
4.2 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro's server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax {...props} on an HTML element and the object keys come from an untrusted source (API, CMS, URL parameters), an attacker can inject arbitrary HTML attributes including event handlers like onmousemove, onclick, or break out of the attribute context entirely to inject new elements. This vulnerability is fixed in 6.4.6.
References
security-advisories@github.comhttps://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9Exploit, Vendor Advisory
Impacted products
Vendor Product Version
astro astro *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "astro",
          "vendor": "withastro",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.4.6"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
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  "configurations": [
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              "matchCriteriaId": "26967691-D061-4128-B17E-09F6E00CB91B",
              "versionEndExcluding": "6.4.6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro\u0027s server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax {...props} on an HTML element and the object keys come from an untrusted source (API, CMS, URL parameters), an attacker can inject arbitrary HTML attributes including event handlers like onmousemove, onclick, or break out of the attribute context entirely to inject new elements. This vulnerability is fixed in 6.4.6."
    }
  ],
  "id": "CVE-2026-54298",
  "lastModified": "2026-06-23T17:17:05.940",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.2,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
          "version": "3.1"
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        "impactScore": 2.5,
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        "type": "Secondary"
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          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "no"
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            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-23T16:10:36.215521Z",
          "version": "2.0.3"
        }
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  },
  "published": "2026-06-22T19:17:21.120",
  "references": [
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      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
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      "url": "https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9"
    },
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  "vulnStatus": "Modified",
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          "value": "CWE-79"
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      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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