{
  "affected": [
    {
      "affectedData": [
        {
          "product": "notesnook",
          "vendor": "streetwriters",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.9"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:streetwriters:notesnook_desktop:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8756DA11-54F2-4580-80D6-B66BDD875599",
              "versionEndExcluding": "3.3.9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:android:*:*",
              "matchCriteriaId": "D6F019A8-553F-4070-8235-F57DC7A489F4",
              "versionEndExcluding": "3.3.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:iphone_os:*:*",
              "matchCriteriaId": "5EFF2675-83AD-4E81-9DDC-A1706C799A00",
              "versionEndExcluding": "3.3.15",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Notesnook is a note-taking app focused on user privacy \u0026 ease of use. Prior to 3.3.9, a Stored Cross-Site Scripting (XSS) vulnerability existed in Notesnook\u0027s editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed() function in component.tsx interpolated the user-supplied URL directly into an HTML string without escaping, which was then assigned to the srcdoc attribute of an \u003ciframe\u003e. This vulnerability is fixed in 3.3.9."
    },
    {
      "lang": "es",
      "value": "Notesnook es una aplicaci\u00f3n para tomar notas centrada en la privacidad del usuario y la facilidad de uso. Previo a la 3.3.9, exist\u00eda una vulnerabilidad de cross-site scripting (XSS) almacenado en el componente de incrustaci\u00f3n del editor de Notesnook al renderizar URLs de incrustaci\u00f3n de Twitter/X. La funci\u00f3n tweetToEmbed() en component.tsx interpolaba la URL proporcionada por el usuario directamente en una cadena HTML sin escapar, la cual se asignaba luego al atributo srcdoc de un . Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 3.3.9."
    }
  ],
  "id": "CVE-2026-31876",
  "lastModified": "2026-06-17T10:34:40.833",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-31876",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-12T20:08:06.045805Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-11T19:16:04.140",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/streetwriters/notesnook/commit/e87f5e5f899f45df28d7c0f33f15e9178d1fbcb7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/streetwriters/notesnook/security/advisories/GHSA-jprx-2w2h-4rh5"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}