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CVE-2026-53523— Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection

Quick assessment

Affected
nezhahq nezha
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nezha是nezhahq组织的一款自托管、轻量级的服务器和网站监控及运维工具。 nezhahq nezha 1.0.0版本至2.2.0之前版本存在输入验证错误漏洞，该漏洞源于oauth2.go:22-29中的getRedirectURL函数在构造OAuth2回调URL时未验证Host标头，可能导致主机头注入。

CVSS 6.8 · Medium EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
nezhahq nezha >= 1.0.0, < 2.2.0 affected
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I. Basic Information for CVE-2026-53523

Vulnerability Information
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Vulnerability Title
Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
nezhahq nezha 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nezha是nezhahq组织的一款自托管、轻量级的服务器和网站监控及运维工具。 nezhahq nezha 1.0.0版本至2.2.0之前版本存在输入验证错误漏洞，该漏洞源于oauth2.go:22-29中的getRedirectURL函数在构造OAuth2回调URL时未验证Host标头，可能导致主机头注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nezhahq nezha >= 1.0.0, < 2.2.0 -

II. Public POCs for CVE-2026-53523

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III. Intelligence Information for CVE-2026-53523

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Vendor Advisories for CVE-2026-53523 (1)

Same Patch Batch · nezhahq · 2026-06-12 · 13 CVEs total

CVE-2026-46716 9.9 CRITICAL Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /ap
CVE-2026-53519 9.1 CRITICAL Nezha Monitoring: Pre-auth path traversal via /dashboard.. prefix confusion leaks jwt_secr
CVE-2026-46717 7.7 HIGH Nezha Monitoring: RoleMember-reachable SSRF with full response-body reflection via POST /a
CVE-2026-47120 7.1 HIGH Nezha Monitoring: RoleMember can fire other users' cron tasks via AlertRule.FailTriggerTas
CVE-2026-48119 7.1 HIGH Nezha Monitoring: Authenticated agents can forge service-monitor results for other users'
CVE-2026-49396 7.1 HIGH Nezha Monitoring: Cross-site GET request can trigger stored cron commands on a victim's ag
CVE-2026-53520 6.5 MEDIUM Nezha Monitoring: Authenticated users can claim the dashboard Host through NAT and preempt
CVE-2026-53522 6.5 MEDIUM Nezha Monitoring: Unbounded WebSocket Streams — Resource Exhaustion DoS
CVE-2026-47124 6.5 MEDIUM Nezha WebSocket server stream discloses cross-tenant server telemetry to authenticated mem
CVE-2026-53521 6.4 MEDIUM Nezha Monitoring: Stored future DDNS profile ID allows unauthorized use of another user's
CVE-2026-47268 6.4 MEDIUM Nezha Monitoring: Authenticated DDNS webhook configuration allows blind SSRF from the dash
CVE-2026-49397 5.3 MEDIUM Nezha Monitoring: Private services (`EnableShowInService: false`) are enumerable via per-s

IV. Related Vulnerabilities

Same product: nezha
Same vendor: nezhahq
Same weakness: CWE-601

V. Comments for CVE-2026-53523

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