{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.3.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "86c56cf827dd6e5ff1b6cd3760f87adc47f58bb1"
            },
            {
              "fixed": "67f7d914f4e40f7cfda229c4865386deeb3c3c2b"
            }
          ],
          "repo": "https://github.com/ether/etherpad",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2jp7-wwpg-3p9w"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55090.json"
  },
  "details": "Etherpad is a real-time collaborative editor. Prior to 3.3.0, getHTMLFromAtext in src/node/utils/ExportHtml.ts interpolates values from the exportHtmlAdditionalTagsWithData plugin hook into span data attributes without HTML attribute escaping. A pad editor can place an attacker-controlled value into the attribute pool through moveOpsToNewPool and AttributePool.putAttrib. When a bundled plugin such as ep_font_color or ep_font_size registers the hook, opening the resulting HTML export causes the value to execute as stored cross-site scripting in the Etherpad origin. This issue is fixed in version 3.3.0.",
  "id": "CVE-2026-55090",
  "modified": "2026-09-11T03:30:41.668435485Z",
  "published": "2026-08-19T19:32:17.607Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ether/etherpad/releases/tag/v3.3.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55090.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ether/etherpad/security/advisories/GHSA-2jp7-wwpg-3p9w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55090"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ether/etherpad/commit/86c56cf827dd6e5ff1b6cd3760f87adc47f58bb1"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ether/etherpad/pull/7905"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Etherpad: Stored XSS in HTML export via unescaped attribute-pool values"
}