{"id":"CVE-2026-48822","summary":"Shaarli has Stored Cross-Site Scripting (XSS) via Markdown Reference Links","details":"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.","aliases":["GHSA-2hgr-63wv-x462"],"modified":"2026-07-08T08:13:37.948690109Z","published":"2026-06-17T19:59:34.277Z","database_specific":{"cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48822.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/shaarli/Shaarli/releases/tag/v0.16.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48822.json"},{"type":"ADVISORY","url":"https://github.com/shaarli/Shaarli/security/advisories/GHSA-2hgr-63wv-x462"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48822"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/shaarli/shaarli","events":[{"introduced":"0"},{"fixed":"e1ef2f4774c6591ac8f4e6260f09363eaf2b5c02"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.16.2"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"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"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N"}]}