CVE-2026-58488 HedgeDoc: Rate-limit bypass via CF-Connecting-IP header spoofing
Attackers can bypass rate limits on login and registration by spoofing the CF-Connecting-IP header, enabling spam and account creation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58488?
CVE-2026-58488 is a medium-severity vulnerability in hedgedoc, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-58488?
How do I fix CVE-2026-58488?
No fix has been published for CVE-2026-58488 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-58488 being exploited?
There is no known exploitation of CVE-2026-58488 in the wild and no public exploit code.
Sources
Also known as GHSA-2f9f-w8xq-276v.