CVE-2026-32133

Received Received - Intake

Blind SSRF in 2FAuth Allows Internal Network Requests

Publication date: 2026-03-11

Last updated on: 2026-03-13

Assigner: GitHub, Inc.

Description

2FAuth is a web app to manage Two-Factor Authentication (2FA) accounts and generate their security codes. Prior to 6.1.0, a blind SSRF vulnerability exists in 2FAuth that allows authenticated users to make arbitrary HTTP requests from the server to internal networks and cloud metadata endpoints. The image parameter in OTP URL is not properly validated for internal / private IP addresses before making HTTP requests. While the previous fix added response validation to ensure only valid images are stored but HTTP request is still made to arbitrary URLs before this validation occurs. This vulnerability is fixed in 6.1.0.

CVSS Scores

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Meta Information

Published

2026-03-11

Last Modified

2026-03-13

Generated

2026-07-06

AI Q&A

2026-03-12

EPSS Evaluated

2026-07-05

NVD

CVE-2026-32133

EUVD

EUVD-2026-11414

Affected Vendors & Products

Vendor	Product	Version / Range
2fauth	2fauth	to 6.1.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

This vulnerability is a blind Server-Side Request Forgery (SSRF) issue in the 2FAuth web application, which manages Two-Factor Authentication accounts and generates security codes. Before version 6.1.0, authenticated users could exploit this flaw to make arbitrary HTTP requests from the server to internal networks and cloud metadata endpoints. The problem arises because the 'image' parameter in the OTP URL is not properly validated to block requests to internal or private IP addresses before the HTTP request is made. Although a previous fix ensured only valid images are stored by validating responses, the HTTP request itself still occurs before this validation, allowing the SSRF attack.

Impact Analysis

This vulnerability can allow an attacker with authenticated access to the 2FAuth application to make unauthorized HTTP requests from the server to internal network resources or cloud metadata services. This could lead to unauthorized access to sensitive internal systems, exposure of confidential information, or manipulation of internal services that are not normally accessible externally.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

The vulnerability is fixed in version 6.1.0 of 2FAuth. Immediate mitigation involves upgrading the 2FAuth application to version 6.1.0 or later.

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