CVE-2026-18639
Velociraptor OIDC Authenticator susceptible to email spoofing
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Velociraptor OIDC Authenticator susceptible to email spoofing
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.
- Record
CVE-2026-18639- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-290
- Updated
- 2026-11-02
EUVDEUVD-2026-56187
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.
- Record
EUVD-2026-56187- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-7v2v-mhwj-r9rw
When Velociraptor is configured to use an OIDC IdP for authentication, it uses the email claim as...
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.
- Record
GHSA-7v2v-mhwj-r9rw- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-290
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-18639- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-290
- Updated
- 2026-11-02
OSV
Velociraptor OIDC Authenticator susceptible to email spoofing
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.
- Record
CVE-2026-18639- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-290
- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:12070-1 No score
velociraptor-0.76.7.0.git145.b60ef1146-1.1 on GA media
These are all security issues fixed in the velociraptor-0.76.7.0.git145.b60ef1146-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:12070-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
velociraptoropenSUSE:Tumbleweed From an advisory covering 40 CVEs |
before 0.76.7.0.git145.b60ef1146-1.1 | 0.76.7.0.git145.b60ef1146-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-18639 is a high vulnerability (CVSS 7.3) in Rapid7 Velociraptor, published August 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.39%, the 33rd percentile. No source names a fixed version.
References
docs.velociraptor.app/announcements/advisories/cve-2026-18639
nvd.nist.gov/vuln/detail/CVE-2026-18639
github.com/advisories/GHSA-7v2v-mhwj-r9rw
suse.com/security/cve/CVE-2025-0914
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