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TI-2026-42092 Aliases CVE-2026-58488

HedgeDoc: Rate-limit bypass via CF-Connecting-IP header spoofing

Priority LOW 37CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass, Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-290 and CWE-770.

Summary

HedgeDoc is an open source, real-time, collaborative, markdown notes application. Versions prior to 1.11.0 allowed attackers to circumvent the rate-limiting of the /login and /register routes by spoofing IP addresses. HedgeDoc instances checked for CloudFlare's cf-connecting-ip header and used that instead of the users real IP address, if the header was present even when the request did not originate from Cloudflare. This made it possible for an attacker to spam login requests or create multiple arbitrary accounts by sending another cf-connecting-ip header every few requests. The issue has been fixed in version 1.11.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00406 35th percentileScored 2026-11-07
Fix Fixed hedgedoc (hedgedoc): 1.11.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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-2026-58488

References

Other 1

  • 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-2026-42090 HedgeDoc: Denial-of-service via YAML alias expansion in note frontmatter CVSS 4.0HIGH 8.3
See all 17 →

Sources

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