CVE-2026-119037

High

Description

Business::GoCardless versions before 1.01 for Perl accept forged webhooks when a configured webhook secret is undef or empty. signature_valid uses each configured secret as the HMAC key, and nothing rejects undef or an empty string, both of which Digest::SHA treats as an empty key. A secret read from an unset environment variable, or an empty entry in a list of rotated secrets, is used as is. A remote attacker can sign a forged webhook with an empty key and have it accepted as sent by GoCardless.

SeverityHigh

CVSS7.5

Exploit probability—

ProductBusiness-gocardless

PublishedOct 30, 2026

First seenNov 4, 2026

Weakness typeCWE-347CWE-347

How to fix

Update

Business-GoCardless1.01 or later

Vendor advisories

metacpan.org/release/LEEJO/Business-GoCardless-1.01/changes

Affected products

Product	Affected versions	Fixed in
Business-GoCardless	v < 1.01	1.01

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