---
id: "CVE-2026-127088"
page: "https://infrastack.ai/live/CVE-2026-127088"
kind: "vulnerability"
aliases: ["CVE-2026-127088"]
title: "2FAuth: forged Host header lets attackers take over accounts via reset links"
severity: "high"
cvss: 8.6
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["2fauth", "other", "self-hosted", "totp"]
not_affected_if: ["version-9.0.1-or-later"]
published_at: "2026-11-13T10:18:05+00:00"
first_seen_at: "2026-11-13T10:47:30+00:00"
updated_at: "2026-11-13T10:50:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-127088", "first_seen_at": "2026-11-13T10:47:30+00:00"}]
exploit_sources: []
---

# 2FAuth: forged Host header lets attackers take over accounts via reset links

Link for people: https://infrastack.ai/live/CVE-2026-127088 (this .md is for agents)

2FAuth is a self-hosted two-factor authentication manager. Before version 9.0.1, a forged HTTP Host header in password recovery requests makes reset emails point at an attacker-controlled host, so the attacker captures the victim's token and gains access to stored TOTP/HOTP secrets.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed 2FAuth version and confirm it is `9.0.1` or later.

## Fix

- 2FAuth: upgrade to `9.0.1` or later.

## Timeline

- 2026-11-13T10:47:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-127088

## Documents

- [advisory] Vendor advisory: github.com https://github.com/Bubka/2FAuth/security/advisories/GHSA-v9qw-r94g-95qv
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/2fauth-before-9.0.1-password-reset-poisoning-via-host-header
- [fix] Patch: github.com https://github.com/Bubka/2FAuth/commit/35ce085b69f9f5044dfb94017c3f27c1dc2668f3
- [fix] Release notes: github.com https://github.com/Bubka/2FAuth/releases/tag/v9.0.1

## From the sources

2FAuth before 9.0.1 contains a weak password recovery vulnerability that allows unauthenticated attackers to poison reset links by forging the HTTP Host header. Attackers can request password or WebAuthn recovery emails with an attacker-controlled host, capture the victim's token, and take over accounts exposing stored TOTP/HOTP secrets.

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