CVE-2020-26286: high-severity vulnerability in hedgedoc
Arbitary file upload
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 1.4%
HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an unauthenticated attacker can upload arbitrary files to the upload storage backend including HTML, JS and PHP files. The problem is patched in HedgeDoc 1.7.1. You should however verify that your uploaded file storage only contains files that are allowed, as uploaded files might still be served. As workaround it's possible to block the `/uploadimage` endpoint on your instance using your reverse proxy. And/or restrict MIME-types and file names served from your upload file storage.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
hedgedoc · hedgedocRelated CVEs — hedgedoc
In the same product, most dangerous first.
CVE-2021-29474MEDIUMRelative Path Traversal Attack on note creationEPSS 1.6%CVE-2020-26287HIGHStored XSS in mermaid diagramsEPSS 1.5%CVE-2021-21259HIGHStored XSS in slide modeEPSS 1.4%CVE-2021-29475CRITICALPDF export allows arbitrary file readsEPSS 1.2%CVE-2022-24837MEDIUMEnumerable upload file names in hedgedocEPSS 1.1%CVE-2021-29503HIGHImproper Neutralization of Script-Related HTML Tags in NotesEPSS 1.0%