CVE-2026-41574Public exploitNetwork attack vector

Account takeover via unverified OAuth email linking

Published May 8, 2026 · Updated May 8, 2026

Improper authentication in Nhost before 0.49.1 allows remote attackers to take over existing accounts through OAuth identity linking. providerFlowSignIn links a new provider identity to an email-matched account without requiring a verified-email status from the adapter. Exploitation requires an unverified email claim from a susceptible Discord, Bitbucket, AzureAD, or EntraID flow; no victim interaction is required.

CVSS severity9.3
Critical
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Nhost before 0.49.1 allows remote attackers to take over existing accounts through OAuth identity linking. providerFlowSignIn links a new provider identity to an email-matched account without requiring a verified-email status from the adapter. Exploitation requires an unverified email claim from a susceptible Discord, Bitbucket, AzureAD, or EntraID flow; no victim interaction is required.

The record

CVE
CVE-2026-41574
Published
May 8, 2026
Updated
May 8, 2026
Vendor
Nhost
Product
Nhost
Classifications
CWE-287, CAPEC-115, CAPEC-151, CAPEC-194, CAPEC-114, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.49.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nhost · Nhostversion=< 0.49.1

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
CAPEC-115Authentication Bypass
CAPEC-151Identity Spoofing
CAPEC-194Fake the Source of Data
CAPEC-114Authentication Abuse
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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