Stored Cross-site Scripting (XSS) in excalidraw's web embed component
Summary
A stored XSS vulnerability in Excalidraw's web embeddable component. This allows arbitrary JavaScript to be run in the context of the domain where the editor is hosted.
Poc
Inserting an embed with the below url (can be copy/pasted onto canvas to insert as embed) will log 42 to the console:
https://gist.github.com/vv=v<script>console.log(42)</script>Details
There were two vectors. One rendering untrusted string as iframe's srcdoc without properly sanitizing against HTML injection. Second by improperly sanitizing against attribute HTML injection. This in conjunction with allowing allow-same-origin sandbox flag (necessary for several embeds) resulted in the XSS.
Former was fixed by no longer rendering unsafe srcdoc content verbatim, and instead strictly parsing the supplied content and constructing the srcdoc manually. The latter by sanitizing properly.
The allow-same-origin flag is now also set only in cases that require it, following the principle of least privilege.
Impact
This is a cross site scripting vulnerability, for more information, please see: https://portswigger.net/web-security/cross-site-scripting
Two npm @excalidraw/excalidraw stable version releases were affected (0.16.x, 0.17.x), and both are now patched.
Betroffene Software
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| Plattform | Paket | Anfällige Versionen | Behoben in |
|---|---|---|---|
| npm-Paket | @excalidraw/excalidraw | >= 0.16.0, < 0.16.4, >= 0.17.0, < 0.17.6 | 0.16.4, 0.17.6 |
Verweise
- https://github.com/excalidraw/excalidraw/security/advisories/GHSA-m64q-4jqh-f72f
- https://nvd.nist.gov/vuln/detail/CVE-2024-32472
- https://github.com/excalidraw/excalidraw/commit/6be752e1b6d776ccfbd3bb9eea17463cb264121d
- https://github.com/excalidraw/excalidraw/commit/988f81911ca58e3ca2583e0dd44a954dd00e09d0
- https://github.com/excalidraw/excalidraw
- CVSS-Vektor
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Schwäche (CWE)
CWE-79- Plattform
- npm
- Paket
@excalidraw/excalidraw- Veröffentlicht
- 17.04.2024
- Aktualisiert
- 11.10.2026 10:22
Quellen und Lizenzen
OSV / GitHub Advisory Database - GHSA-m64q-4jqh-f72f - CC BY 4.0
Schwachstellenhistorie: @excalidraw/excalidraw
Alle veröffentlichten Schwachstellen dieses Pakets (npm-Paket), neueste zuerst. Zeigt, ob es ein einmaliger Ausrutscher ist oder ein Paket, das man im Auge behalten muss.
- Einträge insgesamt
- 3
- Erste → letzte
- 08.2023 04.2026
- Ohne Fix
- 0
- In Angriffen ausgenutzt
- 0
Verteilung nach Schweregrad
- Mittel 3
Veröffentlichungen pro Jahr
- 2023: 1
- 2024: 1
- 2025: 0
- 2026: 1
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Stored Cross-site Scripting (XSS) in excalidraw's web embed component dieser Eintrag
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