FKIE_CVE-2026-54721

Vulnerability from fkie_nvd - Published: 2026-08-27 20:17 - Updated: 2026-08-28 20:18
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Silverstripe UserForms provides a visual form builder for the Silverstripe CMS. From 6.0.0 until 6.4.9, 7.0.7, and 7.1.1, the userform email recipient subject field in the CMS accepts a specially crafted payload that can be interpreted as executable server-side code. An authenticated CMS user with permission to configure a UserForms email recipient can use the subject field to run arbitrary code on the server, compromising confidentiality, integrity, and availability. This issue is fixed in versions 6.4.9, 7.0.7, and 7.1.1.
References
security-advisories@github.comhttps://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702
security-advisories@github.comhttps://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c
security-advisories@github.comhttps://github.com/silverstripe/silverstripe-userforms/pull/1441
security-advisories@github.comhttps://github.com/silverstripe/silverstripe-userforms/pull/1442
security-advisories@github.comhttps://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9
security-advisories@github.comhttps://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7
security-advisories@github.comhttps://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1
security-advisories@github.comhttps://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "silverstripe-userforms",
          "vendor": "silverstripe",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.4.9"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.0.0, \u003c 7.0.7"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.1.0, \u003c 7.1.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Silverstripe UserForms provides a visual form builder for the Silverstripe CMS. From 6.0.0 until 6.4.9, 7.0.7, and 7.1.1, the userform email recipient subject field in the CMS accepts a specially crafted payload that can be interpreted as executable server-side code. An authenticated CMS user with permission to configure a UserForms email recipient can use the subject field to run arbitrary code on the server, compromising confidentiality, integrity, and availability. This issue is fixed in versions 6.4.9, 7.0.7, and 7.1.1."
    }
  ],
  "id": "CVE-2026-54721",
  "lastModified": "2026-08-28T20:18:17.080",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-54721",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-28T15:45:52.816811Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-27T20:17:49.973",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/silverstripe/silverstripe-userforms/pull/1441"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/silverstripe/silverstripe-userforms/pull/1442"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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