CVE-2026-53523CWE-601

Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection

Medium · published June 12, 2026

CVSS v3.1
6.8
EPSS
0%
Percentile
23.4
In the wild
Unconfirmed
What it is

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.0.0 to before version 2.2.0, the getRedirectURL function in oauth2.go:22-29 constructs the OAuth2 callback URL by concatenating the request's Host header with a fixed path, with zero validation of the Host header. This can result in host header injection. This issue has been patched in version 2.2.0.

The record
Technical detail
CVSS v3.1
6.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00317 · 23.4th percentile
Weakness
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
Published
2026-06-12T21:04Z
EPSS history
Timeline
  • 12 JUN 21:04Z
    Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection
    cvelistv5