FKIE_CVE-2026-55085

Vulnerability from fkie_nvd - Published: 2026-08-19 20:17 - Updated: 2026-09-09 21:15
Severity
9.6 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
Summary
Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1.
References
security-advisories@github.comhttps://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319
security-advisories@github.comhttps://github.com/ether/etherpad/pull/7937
security-advisories@github.comhttps://github.com/ether/etherpad/releases/tag/v3.3.1
security-advisories@github.comhttps://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "etherpad",
          "vendor": "ether",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1."
    }
  ],
  "id": "CVE-2026-55085",
  "lastModified": "2026-09-09T21:15:59.613",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 9.6,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55085",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-21T19:46:45.454820Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-19T20:17:17.280",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/ether/etherpad/commit/d828185efcac9abc2e46e6da1c171393500fa319"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/ether/etherpad/pull/7937"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/ether/etherpad/releases/tag/v3.3.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/ether/etherpad/security/advisories/GHSA-f7h5-v9hm-548j"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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