CVE-2026-6939

HIGH
Published Jul 11, 2026 Modified Jul 13, 2026 CWE-79

Description

The CorvusPay WooCommerce Payment Gateway plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'approval_code' parameter in all versions up to, and including, 2.7.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The unauthenticated REST endpoint POST /wp-json/corvuspay/success/ is registered with permission_callback set to __return_true, and although a signature validation step exists it only logs the result without halting execution, meaning an attacker can supply a completely arbitrary signature and have a malicious approval_code stored in the database unchallenged.

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CVSS v3.1 Score

7.2
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0032
Probability of exploitation
0.25%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/tags/2.7.2/includes/class-wc-gateway-corvuspay.php#L1713 https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/tags/2.7.2/includes/class-wc-gateway-corvuspay.php#L202 https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/tags/2.7.2/includes/class-wc-order-corvuspay.php#L185 https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/tags/2.7.3/includes/class-wc-gateway-corvuspay.php#L1713 https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/tags/2.7.3/includes/class-wc-gateway-corvuspay.php#L202 https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/tags/2.7.3/includes/class-wc-order-corvuspay.php#L185 https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/trunk/includes/class-wc-gateway-corvuspay.php#L1713 https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/trunk/includes/class-wc-gateway-corvuspay.php#L202 https://plugins.trac.wordpress.org/browser/corvuspay-woocommerce-integration/trunk/includes/class-wc-order-corvuspay.php#L185 https://plugins.trac.wordpress.org/changeset?reponame=&old=3576949%40corvuspay-woocommerce-integration&new=3576949%40corvuspay-woocommerce-integration

Frequently Asked Questions

What is CVE-2026-6939? +
The CorvusPay WooCommerce Payment Gateway plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'approval_code' parameter in all versions up to, and including, 2.7.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The unauthenticated REST endpoint POST /wp-json/corvuspay/success/ is registered with permission_callback set to __return_true, and although a signature validation step exists it only logs the result without halting execution, meaning an attacker can supply a completely arbitrary signature and have a malicious approval_code stored in the database unchallenged. It has a CVSS v3.1 base score of 7.2 (HIGH).
How severe is CVE-2026-6939? +
CVE-2026-6939 has a CVSS v3.1 score of 7.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0032, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-6939? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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