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CVE-2026-53521— Nezha Monitoring: Stored future DDNS profile ID allows unauthorized use of another user's DDNS profile context

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 2.0.14版本至2.1.0之前版本存在授权问题漏洞，该漏洞源于授权问题，PATCH /server/{id}接受并持久化不存在ddns_profiles ID，可能导致其他用户创建DDNS profile时，攻击者服务器利用该配置进行更新。

CVSS 6.4 · Medium EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
nezhahq nezha >= 2.0.14, < 2.1.0 affected
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I. Basic Information for CVE-2026-53521

Vulnerability Information
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Vulnerability Title
Nezha Monitoring: Stored future DDNS profile ID allows unauthorized use of another user's DDNS profile context
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 2.0.14 to before version 2.1.0, PATCH /server/{id} accepts and persists nonexistent ddns_profiles IDs for a member-owned server. If another user later creates a DDNS profile with one of those IDs, the DDNS worker resolves the stored ID and dispatches an update using the other user's DDNS profile configuration in the context of the attacker's server. This issue has been patched in version 2.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
nezhahq nezha 授权问题漏洞
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 2.0.14版本至2.1.0之前版本存在授权问题漏洞，该漏洞源于授权问题，PATCH /server/{id}接受并持久化不存在ddns_profiles ID，可能导致其他用户创建DDNS profile时，攻击者服务器利用该配置进行更新。
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 >= 2.0.14, < 2.1.0 -

II. Public POCs for CVE-2026-53521

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III. Intelligence Information for CVE-2026-53521

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Vendor Advisories for CVE-2026-53521 (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-2026-53523 6.8 MEDIUM Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection
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-2026-47268 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-863

V. Comments for CVE-2026-53521

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