Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Nezha version 2.2.3 (Go module github.com/nezhahq/nezha) has an OAuth2 redirect_uri host header injection issue when the dashboard_host setting is empty. An attacker who can get a victim to start OAuth2 login through a request carrying a forged Host header can have the victim's authorization code sent to an attacker-controlled origin, if the OAuth2 provider accepts that redirect URI. No fixed version is listed; the source recommends building the callback URL from a configured origin such as install_host, which is a remediation for maintainers rather than a setting users can change.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 9.3 | Critical | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0044, the 39th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:12 UTC First seen by agentprime
- 31 Oct 2026, 14:12 UTC Confirmed by OSV