Vulnerability from bitnami_vulndb
Published
2024-03-06 10:56
Modified
2026-09-10 15:46
Summary
Mastodon vulnerable to Cross-site Scripting through oEmbed preview cards
Details

Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 1.3 and prior to versions 3.5.9, 4.0.5, and 4.1.3, an attacker using carefully crafted oEmbed data can bypass the HTML sanitization performed by Mastodon and include arbitrary HTML in oEmbed preview cards. This introduces a vector for cross-site scripting (XSS) payloads that can be rendered in the user's browser when a preview card for a malicious link is clicked through. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "mastodon",
        "purl": "pkg:bitnami/mastodon"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.3.0"
            },
            {
              "fixed": "3.5.9"
            },
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.0.5"
            },
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "4.1.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-36459"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*"
    ],
    "severity": "Critical"
  },
  "details": "Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 1.3 and prior to versions 3.5.9, 4.0.5, and 4.1.3, an attacker using carefully crafted oEmbed data can bypass the HTML sanitization performed by Mastodon and include arbitrary HTML in oEmbed preview cards. This introduces a vector for cross-site scripting (XSS) payloads that can be rendered in the user\u0027s browser when a preview card for a malicious link is clicked through. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.",
  "id": "BIT-mastodon-2023-36459",
  "modified": "2026-09-10T15:46:03.895Z",
  "published": "2024-03-06T10:56:45.177Z",
  "references": [
    {
      "type": "DISCUSSION",
      "url": "http://www.openwall.com/lists/oss-security/2023/07/06/5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/mastodon/mastodon/releases/tag/v3.5.9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/mastodon/mastodon/releases/tag/v4.0.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/mastodon/mastodon/releases/tag/v4.1.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hp"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-36459"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "Mastodon vulnerable to Cross-site Scripting through oEmbed preview cards"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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