---
id: "CVE-2026-11960"
kind: "vulnerability"
aliases: ["CVE-2026-11960"]
title: "FacturaScripts: login responses reveal which usernames exist"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["facturascripts", "package", "php", "self-hosted"]
not_affected_if: ["auth-required", "network-restricted"]
published_at: "2026-10-20T09:17:09+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-25T03:40:38+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11960", "first_seen_at": "2026-10-23T21:57:20+00:00"}]
---

# FacturaScripts: login responses reveal which usernames exist

FacturaScripts version 2025.61 answers a login attempt differently for valid and invalid usernames, through error messages, timing or HTTP status. An unauthenticated attacker can use this to build a list of real accounts for brute-force, password spraying or phishing.

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

## How to check

- Confirm the installed version (`2025.61`) in the FacturaScripts admin panel or the project's version file
- Send two login attempts, one with a known-valid username and one with a made-up username, and compare the error text, status code and response time

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-11960

## From the sources

Enumeration of unauthenticated users in FacturaScripts, version 2025.61. The application returns different responses when attempting to log in with a valid username compared to an invalid one. An unauthenticated attacker could systematically identify valid usernames by examining variations in the application’s responses, such as changes in response time, discrepancies between error messages or differences in HTTP status codes. A successful exploit allows the attacker to compile a list of valid user accounts. This list could be used to carry out targeted brute-force attacks, password spraying, credential stuffing or social engineering campaigns against the confirmed accounts.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_