Vulnerability · Published Oct 30, 2026 · Assigned by CPANSec
CVE-2026-119037Business::GoCardless versions before 1.01 for Perl accept forged webhooks when a configured webhook secret is undef or empty
Unrated
In plain English
A security flaw in Business-GoCardless. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Business-GoCardless | 0 – before 1.01 |
Weakness: CWE-347