---
id: "CVE-2026-126815"
page: "https://infrastack.ai/live/CVE-2026-126815"
kind: "vulnerability"
aliases: ["CVE-2026-126815"]
title: "Lagarto Chivato: pre-account hijacking lets attackers take over accounts"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Lagarto Chivato", "fixed": ["0.4.4"], "affected": ">= 0.1.0, <= 0.4.2", "ecosystem": "vendor"}]
ecosystems: []
tags: ["lagarto-chivato", "other", "self-hosted", "web"]
not_affected_if: ["unknown"]
published_at: "2026-11-11T20:17:07+00:00"
first_seen_at: "2026-11-11T20:28:52+00:00"
updated_at: "2026-11-11T20:31:39+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126815", "first_seen_at": "2026-11-11T20:28:52+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126815", "first_seen_at": "2026-11-11T20:31:39+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-126815"]}]
exploit_sources: []
---

# Lagarto Chivato: pre-account hijacking lets attackers take over accounts

Link for people: https://infrastack.ai/live/CVE-2026-126815 (this .md is for agents)

Lagarto Chivato 0.4.1 and earlier, on its web interface, lets an attacker set a password on an unregistered email address. When the real owner of that address later signs in without a password, the attacker's password becomes valid and the attacker gets into the account.

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

## Affected

- vendor:Lagarto Chivato affected >= 0.1.0, <= 0.4.2 fixed 0.4.4

## How to check

Check the installed Lagarto Chivato version. NVD's CNA table lists 0.1.0 through 0.4.2 as affected and 0.4.4 as unaffected; the CVE text says 0.4.1 and earlier. Then see whether passwordless (email) sign-in is enabled and whether a password can be set on an email address that has no account yet.

## Fix

NVD's CNA record lists 0.4.4 as unaffected. No vendor or maintainer page confirms it; the CVE text itself only says 0.4.1 and earlier.

## Timeline

- 2026-11-11T20:28:52+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126815
- 2026-11-11T20:31:39+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-126815 — Only source is the NVD record (CNA Grayback). Its description says 0.4.1 and earlier, but its affected-products table says 0.1.0 through 0.4.2 affected and 0.4.4 unaffected. Grayback's advisories page and the XauenDevs GitHub did not list the issue, so I found no vendor or maintainer page. Nothing marked verified. Passwordless login default unknown.

## Documents

- [advisory] NVD CVE-2026-126815 (CNA: Grayback) https://nvd.nist.gov/vuln/detail/CVE-2026-126815

## From the sources

Pre-account hijacking in the authentication flow in Lagarto Chivato 0.4.1 and earlier on Web allows remote unauthenticated attackers to take over arbitrary accounts via a password planted on an unregistered email address that becomes valid upon the victim’s first passwordless login.

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