Shaarli has Stored Cross-Site Scripting (XSS) via Markdown Reference Links

{
  "id": "a821581f0ca93b9f901c2eb4e78c30b9427b6a990e1242cd63b2212a1db7bca2",
  "url": "https://osv.dev/vulnerability/CVE-2026-48822",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Shaarli has Stored Cross-Site Scripting (XSS) via Markdown Reference Links",
    "summary": "Shaarli is a personal bookmarking service. Versions 0.16.1 and prior contain a stored Cross-Site Scripting (XSS) vulnerability in the Markdown-to-HTML conversion process used in the Bookmark Description field. An authenticated user can inject a malicious javascript: URI inside a Markdown link. The vulnerability originates in the filterProtocols method within BookmarkMarkdownFormatter.php.This method attempts to sanitize Markdown links by filtering dangerous protocols (such as javascript:) before rendering. It uses the following regular expression: (#]\\((.*?)\\)#is). This regex is designed to detect inline Markdown links, but it fails to detect Markdown reference-style links because reference-style links are resolved by the Markdown parser after preprocessing. The filterProtocols method never inspects the actual URL used in these references and as a result, an attacker can supply a javascript: URI inside a reference definition. This issue has been fixed in version 0.16.2.",
    "evidence": "osv:CVE-2026-48822",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-48822",
      "aliases": [
        "CVE-2026-48822",
        "GHSA-2hgr-63wv-x462"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/shaarli/shaarli",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e1ef2f4774c6591ac8f4e6260f09363eaf2b5c02"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.16.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e1ef2f4774c6591ac8f4e6260f09363eaf2b5c02"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.16.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.16.1",
            "v0.16.0",
            "v0.7.0",
            "help",
            "v0.8.1",
            "v0.8.0",
            "v0.6.5",
            "v0.6.4",
            "v0.6.3",
            "v0.6.2",
            "v0.6.1",
            "v0.5.4",
            "v0.5.3",
            "0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.0.45beta",
            "v0.0.44beta",
            "v0.0.43beta",
            "v0.0.42beta",
            "v0.0.41beta",
            "v0.0.40beta"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48822.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.814882742Z",
      "provider": "osv",
      "references": [
        "https://github.com/shaarli/Shaarli/releases/tag/v0.16.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48822.json",
        "https://github.com/shaarli/Shaarli/security/advisories/GHSA-2hgr-63wv-x462",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-48822"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48822.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-48822",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497580,
  "published_at": "2026-06-17T19:59:34.277+00:00"
}