CVE-2026-58488 PUBLISHED

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

Assigner: GitHub_M
Reserved: 30.06.2026 Published: 13.07.2026 Updated: 14.07.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 6.9

Product Status

Vendor hedgedoc
Product hedgedoc
Versions
  • Version < 1.11.0 is affected

References

Problem Types

  • CWE-290: Authentication Bypass by Spoofing CWE
  • CWE-770: Allocation of Resources Without Limits or Throttling CWE