Velociraptor OIDC Authenticator susceptible to email spoofing (CVE-2026-18639) | HOL Guard CVE

High · CVSS 7.3CVE-2026-18639

Velociraptor OIDC Authenticator susceptible to email spoofing

Answer in brief

CVE-2026-18639 records a High severity (CVSS 7.3) vulnerability in Velociraptor OIDC Authenticator susceptible to email spoofing. The current sources do not mark it as known exploited. The current feed maps Rapid7/Velociraptor (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 11, 2026Updated Aug 28, 2026Source checked Sep 25, 2026First seen by HOL Aug 11, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Rapid7/Velociraptor (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Rapid7/Velociraptorgeneric	>=0 <0.77.2	0.77.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for Rapid7/Velociraptor.
Review the reported fix. Update Rapid7/Velociraptor to 0.77.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Source referencedocs.velociraptor.app

Upstream source description

When Velociraptor is configured to use an OIDC IdP for authentication, it uses the email claim as a username. However, some IdP allow users to change the email claim without verification. Some IdPs do not set the "email_verified" claim and do not actually verify the email. This allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover.

Quoted source text, attributed separately from HOL analysis.