HedgeDoc is a platform to write and share markdown. HedgeDoc before version 1.8.2 is vulnerable to a cross-site scripting attack using the YAML-metadata of a note. An attacker with write access to a note can embed HTML tags in the Open Graph metadata section of the note, resulting in the frontend rendering the script tag as part of the `<head>` section. Unless your instance prevents guests from editing notes, this vulnerability allows unauthenticated attackers to inject JavaScript into notes that allow guest edits. If your instance prevents guests from editing notes, this vulnerability allows authenticated attackers to inject JavaScript into any note pages they have write-access to. This vulnerability is patched in version 1.8.2. As a workaround, one can disable guest edits until the next update.
References
| Link | Resource |
|---|---|
| https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7 | Patch Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq | Patch Third Party Advisory |
| https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2 | Third Party Advisory |
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Configurations
Information
Published : 2021-05-19 13:15
Updated : 2022-04-25 13:09
NVD link : CVE-2021-29503
Mitre link : CVE-2021-29503
JSON object : View
CWE
CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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Products Affected
hedgedoc
- hedgedoc