Description
hoppscotch is an open source API development ecosystem. Prior to version 2026.2.0, an unauthenticated attacker can overwrite the entire infrastructure configuration of a self-hosted Hoppscotch instance including OAuth provider credentials and SMTP settings by sending a single HTTP POST request with no authentication. The endpoint POST /v1/onboarding/config has no authentication guard and performs no check on whether onboarding was already completed. A successful exploit allows the attacker to replace the instance's Google/GitHub/Microsoft OAuth application credentials with their own, causing all subsequent user logins via SSO to authenticate against the attacker's OAuth app. The attacker captures OAuth tokens and email addresses of every user who logs in after the exploit. Additionally, the endpoint returns a recovery token that can be used to read all stored secrets in plaintext, including SMTP passwords and any other configured credentials. Version 2026.2.0 fixes the issue.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2026-8912
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2026-8912 affects the Hoppscotch open-source API development ecosystem. Prior to version 2026.2.0, an unauthenticated attacker can exploit a critical flaw in the POST /v1/onboarding/config endpoint, which lacks proper authentication and validation checks. This allows the attacker to overwrite the entire infrastructure configuration, including OAuth provider credentials and SMTP settings.
Severity Evaluation:
- CVSS Base Score: 9.1
- CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
The high base score indicates a critical vulnerability due to the ease of exploitation (low complexity, no authentication required) and the significant impact on confidentiality and integrity.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Unauthenticated HTTP POST Request: An attacker can send a crafted HTTP POST request to the
/v1/onboarding/configendpoint without any authentication. - Configuration Overwrite: The attacker can overwrite critical configuration settings, including OAuth provider credentials and SMTP settings.
- Token Capture: By replacing OAuth application credentials, the attacker can capture OAuth tokens and email addresses of users logging in via Single Sign-On (SSO).
- Recovery Token Exploitation: The endpoint returns a recovery token that can be used to read all stored secrets in plaintext, including SMTP passwords and other configured credentials.
Exploitation Methods:
- Automated Scripts: Attackers can use automated scripts to send the malicious HTTP POST request to multiple Hoppscotch instances.
- Phishing Campaigns: Combining this vulnerability with phishing campaigns to lure users into logging in via SSO, thereby capturing their credentials.
3. Affected Systems and Software Versions
Affected Systems:
- Self-hosted Hoppscotch instances prior to version 2026.2.0.
Software Versions:
- All versions of Hoppscotch before 2026.2.0.
4. Recommended Mitigation Strategies
Immediate Actions:
- Upgrade to Version 2026.2.0: Immediately update all self-hosted Hoppscotch instances to version 2026.2.0 or later.
- Network Segmentation: Isolate Hoppscotch instances from public networks until the update is applied.
- Monitoring and Logging: Enable comprehensive logging and monitoring to detect any unauthorized access attempts.
Long-Term Strategies:
- Regular Security Audits: Conduct regular security audits and vulnerability assessments.
- Access Controls: Implement strict access controls and authentication mechanisms for all endpoints.
- Incident Response Plan: Develop and maintain an incident response plan to quickly address any security breaches.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to organizations within the European Union that rely on Hoppscotch for API development. The potential for unauthorized access to sensitive information, including OAuth tokens and email addresses, can lead to data breaches and compliance issues under regulations such as GDPR. The ease of exploitation and the critical nature of the vulnerability underscore the need for robust cybersecurity practices and timely updates.
6. Technical Details for Security Professionals
Vulnerability Details:
- Endpoint:
POST /v1/onboarding/config - Authentication: None
- Validation Checks: None
- Impact: Overwrite of infrastructure configuration, capture of OAuth tokens, and exposure of stored secrets.
Detection and Response:
- Intrusion Detection Systems (IDS): Deploy IDS to detect unusual HTTP POST requests to the
/v1/onboarding/configendpoint. - Log Analysis: Regularly analyze logs for any unauthorized access attempts or configuration changes.
- Incident Response: In case of a detected exploit, immediately isolate the affected instance, restore configurations from a trusted backup, and notify affected users.
References:
By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with EUVD-2026-8912 and enhance their overall cybersecurity posture.