CVE-2026-58488

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

State: Published
Severity: 6.9 Medium
Published: Jul 13, 2026
Updated: Jul 14, 2026
Reserved: Jun 30, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
hedgedochedgedoc	< 1.11.0Affected

References

https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-2f9f-w8xq-276v

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