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TI-2020-16107 Aliases CVE-2020-26286

Arbitary file upload

Priority LOW 36CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434.

Summary

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.

Why it matters now

EPSS 0.01437 73rd percentileScored 2026-11-07
Fix Fixed hedgedoc (hedgedoc): 1.7.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
hedgedochedgedocbefore 1.7.11.7.1Patch availableCNA
  • hedgedoc Vendorhedgedoc Affected before 1.7.1 Fixed in 1.7.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:*before 1.7.1Vulnerablehedgedoc
  • cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:* Versions before 1.7.1 Vulnerable ·hedgedoc

Remediation

  • Fix · CNA hedgedoc (hedgedoc) Fixed in 1.7.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-26286

References

Patch 1

Advisory 2

  • TI-2023-19867 HedgeDoc API allows to hide existing notes CVSS 3.1HIGH 8.2
  • TI-2024-30379 MySQL & free URL mode allows to hide existing notes in hedgedoc CVSS 3.1MEDIUM 6.5
  • TI-2021-10188 PDF export allows arbitrary file reads CVSS 3.1CRITICAL 10.0
  • TI-2020-16108 Stored XSS in mermaid diagrams CVSS 3.1HIGH 8.7
  • TI-2021-10211 Improper Neutralization of Script-Related HTML Tags in Notes CVSS 3.1HIGH 8.1
  • TI-2021-16561 XSS vector in slide mode speaker-view CVSS 3.1HIGH 8.1
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences