CVE-2026-119037

Business::GoCardless versions before 1.01 for Perl accept forged webhooks when a configured webhook secret is undef or empty

Published Oct 30, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Upgrade to Business-GoCardless 1.01 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Type Values Removed Values Added
First Time appeared Perl
Perl business::gocardless
Vendors & Products Perl
Perl business::gocardless
Type Values Removed Values Added
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.
Title Business::GoCardless versions before 1.01 for Perl accept forged webhooks when a configured webhook secret is undef or empty
Weaknesses CWE-347
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
CPANSec
Published
Updated
Nov 6, 2026, 3:53 PM
Reserved
Oct 29, 2026, 11:38 AM
Status
Deferred
Published
Oct 30, 2026, 1:18 PM
Modified
Nov 6, 2026, 4:17 PM