HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. ### Workarounds Disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content. ### References This issue was discovered by @TobiasHoll and reported to hackmdio/codimd: https://github.com/hackmdio/codimd/issues/1648 ### For more information If you have any questions or comments about this advisory: * Open an topic on our community forum * Join our matrix room
HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. ### Workarounds Disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content. ### References This issue was discovered by @TobiasHoll and reported to hackmdio/codimd: https://github.com/hackmdio/codimd/issues/1648 ### For more information If you have any questions or comments about this advisory: * Open an topic on our community forum * Join our matrix room
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NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
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HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode.
Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes.
The problem is patched in HedgeDoc 1.7.2.
### Workarounds
Disallow loading JavaScript from 3rd party sites using the `Content-Secu
HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. ### Workarounds Disallow loading JavaScript from 3rd party sites using the `Content-Security
Quick Info
CVE Dictionary Entry: CVE-2021-21259 NVD
Published Date: 01/22/2021 NVD
Last Modified: 02/01/2021
Source: GitHub, Inc.
