# Login using WordPress Users ( WP as SAML IDP ) <= 2.0.1 - Unauthenticated Denial of Service via SP Tracking Cookie

- **ID:** WPSEC-2026-0872
- **Plugin:** SAML IDP (Identity Provider) – Login with Website Users (`miniorange-wp-as-saml-idp`), https://wordpress.org/plugins/miniorange-wp-as-saml-idp/
- **Affected versions:** all versions before 2.0.2
- **Fixed in:** 2.0.2 (Update to 2.0.2 or later.)
- **Severity:** High 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **Weakness:** CWE-834
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-10-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/miniorange-wp-as-saml-idp
- **Fix released:** 2026-10-13
- **Published:** 2026-10-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0872/

## Description

The SAML IDP (Identity Provider) plugin for WordPress is vulnerable to Denial of Service via the mo_sp_count cookie in all versions up to, and including, 2.0.1. The mo_idp_add_sp_cookie() function uses the cookie value supplied by the user as the upper bound of a loop without checking or limiting it. This makes it possible for unauthenticated attackers to send a request with a very large mo_sp_count value. Each request then keeps a PHP worker busy until the maximum execution time is reached, and a small number of concurrent requests can make the site unavailable.

## References

- https://wpsec.com/vuln/WPSEC-2026-0872/
- https://plugins.svn.wordpress.org/miniorange-wp-as-saml-idp/tags/2.0.2/
- https://wordpress.org/plugins/miniorange-wp-as-saml-idp/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0872/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.