# CVE-2026-119037: Business::GoCardless versions before 1.01 for Perl accept forged webhooks when a configured webhook secret is undef or empty

Status: published. Published: 2026-10-30. Updated: 2026-11-06.

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

- fix: Upgrade to Business-GoCardless 1.01 or later. (source: CNA: CPANSec)

## Affected products and versions

-  /  (Business-GoCardless): ≥ 0; < 1.01 (affected, custom). Source: CNA: CPANSec

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: 0.12% as of 2026-11-06; percentile 2.08%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-347

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://metacpan.org/release/LEEJO/Business-GoCardless-1.01/changes (CNA: CPANSec; release-notes)

## Provenance

- CNA: CPANSec: https://www.cve.org/CVERecord?id=CVE-2026-119037; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-119037; retrieved 2026-11-06; source updated Not reported

Revision: 8027d20c8c35a194407628e4ab9b4f7191b0fd0a98fedf34cb41df3895e14f92

Canonical: https://y2.dev/cve/CVE-2026-119037

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