Vulnerability · Published Jul 13, 2026 · Assigned by GitHub_M

CVE-2026-58488HedgeDoc: Rate-limit bypass via CF-Connecting-IP header spoofing

Medium 6.9

In plain English

A medium-severity authentication bypass by spoofing in hedgedoc from hedgedoc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.4%top 65.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
hedgedoc	hedgedoc	< 1.11.0

Weakness: CWE-290, CWE-770 · 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

References

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