CVE-2026-54889
- Source
- https://cve.org/CVERecord?id=CVE-2026-54889
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54889.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-54889
- Aliases
-
- EEF-CVE-2026-54889
- GHSA-4383-7xfp-gpph
- Published
- 2026-06-29T19:10:49.841Z
- Modified
- 2026-07-15T01:49:07.930746543Z
- Severity
-
- 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N CVSS Calculator
- Summary
- Unsanitized URL schemes in MDEx Quill Delta output allow javascript: injection (XSS)
- Details
-
Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in leandrocp mdex allows cross-site scripting via unsanitized URL schemes in Quill Delta output.
'Elixir.MDEx':todelta/2 converts Markdown into a Quill Delta. 'Elixir.MDEx.DeltaConverter':defaultconvertnode/3 in lib/mdex/deltaconverter.ex copies the URL of a link, wikilink, or image node directly from the parsed Markdown into the Delta "link" or "image" attribute without applying a scheme allowlist or any normalization.
An attacker who controls the Markdown text can supply a javascript: URL (for example click) that survives verbatim into the Delta attribute. When the Delta is rendered to HTML by a downstream renderer (such as quill-delta-to-html or the Quill client), the attribute becomes an <a href> or <img src>, and the javascript: scheme executes in the browser of anyone who views the rendered content. The link and wikilink cases are the strongest vectors because javascript: in an href executes on click; the image case is lower impact because javascript: in <img src> generally does not execute in modern browsers.
This issue affects mdex: from 0.8.3 before 0.13.2.
- Database specific
{ "cwe_ids": [ "CWE-79" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54889.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "9852db2456fdc9d856eb636603a7f608e22e3793" }, { "fixed": "2817147f5b87ce7186aa604c9ee72499485b8f2f" } ], "source": "AFFECTED_FIELD" } ], "cna_assigner": "EEF" }- References
-
- https://cna.erlef.org/cves/CVE-2026-54889.html
- https://github.com
- https://osv.dev/vulnerability/EEF-CVE-2026-54889
- https://repo.hex.pm
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54889.json
- https://github.com/leandrocp/mdex/security/advisories/GHSA-4383-7xfp-gpph
- https://nvd.nist.gov/vuln/detail/CVE-2026-54889
- https://github.com/leandrocp/mdex/commit/2817147f5b87ce7186aa604c9ee72499485b8f2f
- https://github.com/leandrocp/mdex