CVE-2026-101090

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-27. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Nezha 2.2.3 contains a Host header injection regression in the OAuth2 redirect endpoint. When the new optional dashboard_host setting is empty, /api/v1/oauth2/{provider} (cmd/dashboard/controller/oauth2.go) reflects the attacker-supplied HTTP Host header into the redirect_uri sent to the identity provider instead of falling back to the configured install_host. An attacker who induces a victim to begin OAuth2 login via a request that reaches Nezha with a forged Host header can cause an attacker-controlled callback URL to be used as the redirect_uri; if the OAuth2 provider accepts it, the victim's authorization code is delivered to the attacker origin, allowing the attacker to complete the OAuth2 login/binding flow and take over the account. This regresses the fix for GHSA-9rc6-8cjv-rcvx and is configuration-dependent (dashboard_host empty). At the time of the advisory no patched version was available.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
75
EG Risk 75/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
27th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 27, 2026

Last Modified

September 28, 2026

Advisory Details (2)

Auto-updated Sep 28, 2026
Patch available. Sources: github.
github Patch Available

OAuth2 redirect_uri Host header injection regression when dashboard_host is empty · Advisory · nezhahq/nezha · GitHub

https://github.com/nezhahq/nezha/security/advisories/GHSA-rf68-8gjr-36q7
generic

Nezha through 2.2.3 Host Header Injection via OAuth2 redirect_uri | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nezha-through-2.2.3-host-header-injection-via-oauth2-redirect-uri

Vendor Advisories for CVE-2026-101090(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/nezhahq/nezha2.2.3——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 56× in last 7d / 56× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 12:23 UTCGHSA enrichment
  2. 2026-10-04 08:04 UTCGHSA enrichment
  3. 2026-10-04 03:47 UTCGHSA enrichment
  4. 2026-10-03 23:29 UTCGHSA enrichment
  5. 2026-10-03 19:10 UTCGHSA enrichment
  6. 2026-10-03 14:53 UTCEG score recompute
  7. 2026-10-03 14:53 UTCGHSA enrichment
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-03 10:35 UTCGHSA enrichment
  10. 2026-10-03 06:14 UTCGHSA enrichment
  11. 2026-10-03 01:56 UTCGHSA enrichment
  12. 2026-10-02 21:38 UTCGHSA enrichment
  13. 2026-10-02 17:20 UTCEG score recompute
  14. 2026-10-02 17:20 UTCGHSA enrichment
  15. 2026-10-02 12:57 UTCGHSA enrichment
  16. 2026-10-02 08:39 UTCGHSA enrichment
  17. 2026-10-02 04:22 UTCGHSA enrichment
  18. 2026-10-02 00:02 UTCEG score recompute
  19. 2026-10-02 00:02 UTCGHSA enrichment
  20. 2026-10-01 19:49 UTCEPSS rescore
  21. 2026-10-01 18:49 UTCGHSA enrichment
  22. 2026-10-01 14:30 UTCGHSA enrichment
  23. 2026-10-01 10:12 UTCGHSA enrichment
  24. 2026-10-01 05:54 UTCGHSA enrichment
  25. 2026-10-01 01:36 UTCGHSA enrichment
Show 31 more
  1. 2026-09-30 21:19 UTCGHSA enrichment
  2. 2026-09-30 17:01 UTCEG score recompute
  3. 2026-09-30 17:01 UTCGHSA enrichment
  4. 2026-09-30 15:02 UTCEPSS rescore
  5. 2026-09-30 12:43 UTCGHSA enrichment
  6. 2026-09-30 08:26 UTCGHSA enrichment
  7. 2026-09-30 04:08 UTCGHSA enrichment
  8. 2026-09-29 23:46 UTCGHSA enrichment
  9. 2026-09-29 18:48 UTCEG score recompute
  10. 2026-09-29 18:48 UTCGHSA enrichment
  11. 2026-09-29 15:20 UTCEPSS rescore
  12. 2026-09-29 14:29 UTCGHSA enrichment
  13. 2026-09-29 10:10 UTCGHSA enrichment
  14. 2026-09-29 05:48 UTCGHSA enrichment
  15. 2026-09-29 01:30 UTCEG score recompute
  16. 2026-09-29 01:30 UTCGHSA enrichment
  17. 2026-09-28 21:13 UTCGHSA enrichment
  18. 2026-09-28 17:53 UTCEG score recompute
  19. 2026-09-28 17:53 UTCGHSA enrichment
  20. 2026-09-28 13:50 UTCEPSS rescore
  21. 2026-09-28 13:29 UTCEG score recompute
  22. 2026-09-28 13:29 UTCGHSA enrichment
  23. 2026-09-28 13:07 UTCEG score recompute
  24. 2026-09-28 13:07 UTCGHSA enrichment
  25. 2026-09-28 10:20 UTCGHSA enrichment
  26. 2026-09-28 06:02 UTCGHSA enrichment
  27. 2026-09-28 01:44 UTCEG score recompute
  28. 2026-09-28 01:44 UTCGHSA enrichment
  29. 2026-09-27 21:25 UTCEG score recompute
  30. 2026-09-27 21:00 UTCEG score recompute
  31. 2026-09-27 21:00 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-101090?
CVE-2026-101090 is a critical vulnerability published on September 27, 2026. Nezha 2.2.3 contains a Host header injection regression in the OAuth2 redirect endpoint. When the new optional dashboardhost setting is empty, /api/v1/oauth2/{provider} (cmd/dashboard/controller/oauth2.go) reflects the attacker-supplied HTTP Host header into the redirecturi sent to the identity…
When was CVE-2026-101090 disclosed?
CVE-2026-101090 was first published on September 27, 2026, with the most recent update on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-101090 actively exploited?
CVE-2026-101090 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-101090?
CVE-2026-101090 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-101090?
A fix for CVE-2026-101090 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-101090 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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