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CVE-2026-53523

Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection

Published: Jun 12, 2026Updated: Jun 12, 2026 Sources: CVE List NVD
NVD MITRE
6.8CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None

Weaknesses

CWE-601

Affected Products

nezha
nezhahq

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx
github.com

Timeline

Published
Jun 12, 2026
Last Updated
Jun 12, 2026

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