Woo Swish e-commerce <= 3.7.8 - Unauthenticated Authentication Bypass to Payment Service Credential Injection via Legacy OAuth Callback
- ID
- WPSEC-2026-1266
- Plugin
- BjornTech Swish for WooCommerce (woo-swish-e-commerce)
- Affected
- all versions before 3.7.9
- Remediation
- Update to 3.7.9 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
- Weakness
- CWE-287
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-20
- Attack surface
- Woo Swish e-commerce on WPSec AttackSurface
- Fix released
- Published
Description
The BjornTech Swish for WooCommerce plugin for WordPress is vulnerable to Authentication Bypass via the swish_admin WooCommerce API callback (admin_handler) in all versions up to, and including, 3.7.8. This is due to the handler comparing the JSON-supplied nonce and account UUID against the stored connection nonce and account UUID with loose (==) comparisons. Boolean or empty JSON values pass these checks whether or not a connection is pending. This makes it possible for unauthenticated attackers to overwrite the stored BjornTech service refresh token with a value they choose. This can tamper with or break the site's Swish payment integration.
References
- https://wpsec.com/vuln/WPSEC-2026-1266/
- https://plugins.svn.wordpress.org/woo-swish-e-commerce/tags/3.7.9/
- https://wordpress.org/plugins/woo-swish-e-commerce/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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