# CVE-2026-126307: Nezha Dashboard before 2.6.0 Multiple Authorization and Tenant Isolation Flaws

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

Nezha Dashboard before 2.6.0 contains multiple authorization, tenant isolation, and resource exhaustion vulnerabilities that allow members or unauthenticated attackers to abuse NAT, DDNS, OAuth, cron, and server transfer features. Attackers can claim undeclared Dashboard hostnames to capture login bodies, hijack DDNS profiles, create executable schedules without exec scope, or exhaust memory via buffered NAT requests.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/nezhahq/nezha/commit/027bfcf6521f192635b946b7583c3ab39500ab98
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/nezhahq/nezha/commit/7cd0371b56f7bce83c3953b2bf4711b2105d5818

## Affected products and versions

- nezhahq / nezha (github.com/nezhahq/nezha): ≥ 0; < 2.6.0 (affected, semver); 2.6.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-863

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/nezhahq/nezha/security/advisories/GHSA-63mg-cxm4-98q3 (CNA: VulnCheck; vendor-advisory)

- https://github.com/nezhahq/nezha/commit/027bfcf6521f192635b946b7583c3ab39500ab98 (CNA: VulnCheck; patch)

- https://github.com/nezhahq/nezha/commit/7cd0371b56f7bce83c3953b2bf4711b2105d5818 (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/nezha-dashboard-before-2.6.0-multiple-authorization-and-tenant-isolation-flaws (CNA: VulnCheck; third-party-advisory)

- https://github.com/nezhahq/nezha/commit/027bfcf6521f192635b946b7583c3ab39500ab98 (disclosure@vulncheck.com)

- https://github.com/nezhahq/nezha/commit/7cd0371b56f7bce83c3953b2bf4711b2105d5818 (disclosure@vulncheck.com)

- https://github.com/nezhahq/nezha/security/advisories/GHSA-63mg-cxm4-98q3 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/nezha-dashboard-before-2.6.0-multiple-authorization-and-tenant-isolation-flaws (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126307; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126307; retrieved 2026-11-13; source updated 2026-11-13

Revision: 497c666a2b25122d40f6b587d4307c5ad16be76122ab27d4cdacf48e1edef650

Canonical: https://y2.dev/cve/CVE-2026-126307

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