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TI-2026-42093 Aliases CVE-2026-58489

HedgeDoc: CSRF in GitHub Gist export callback

Priority LOW 29CWE-352Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Active
Attack complexity
High
Attack requirements
Present
Impact type
Tampering
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-352.

Summary

HedgeDoc is an open source, real-time collaborative markdown notes application. Prior to 1.11.0, the GitHub Gist export flow created an OAuth2  state  value but only checked that it was present rather than validating it against the value expected for the user's session. Because the state was not properly validated, an attacker could forge a callback URL containing their own valid GitHub OAuth code. When processing the callback, HedgeDoc used the victim's logged-in session to select which note to export, but the attacker's authorization code to determine which GitHub account received it. As a result, a logged-in victim who clicked a crafted link could export their own private, protected, or limited note directly into a Gist controlled by the attacker. This issue has been fixed in version 1.11.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00172 6th percentileScored 2026-11-07
Fix Fixed hedgedoc (hedgedoc): 1.11.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
hedgedochedgedocbefore 1.11.01.11.0Patch availableCNA
  • hedgedoc Vendorhedgedoc Affected before 1.11.0 Fixed in 1.11.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:*——hedgedoc
  • cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:* Versions — — ·hedgedoc

Remediation

  • Fix · CNA hedgedoc (hedgedoc) Fixed in 1.11.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58489

References

Other 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-2026-42092 HedgeDoc: Rate-limit bypass via CF-Connecting-IP header spoofing CVSS 4.0MEDIUM 6.9
  • TI-2021-10211 Improper Neutralization of Script-Related HTML Tags in Notes CVSS 3.1HIGH 8.1
See all 17 →

Sources

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