Vulnerability in Coopcycle Coopcycle-Web
CVE-2026-121620
CoopCycle coopcycle-web 5.6.0 before 6.20.0 contains a missing authentication vulnerability that allows unauthenticated attackers to forge Zelty webhook events because the x-zelty-hmac-sha256 HMAC signature is never verified. Attackers can POST forged dish, menu, option and order-status events to /api/zelty/webhook/* endpoints to toggle restaurant products and alter order preparation states.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/coopcycle/coopcycle-web/commit/9b499950d433ca8ba894996d6b17f49885ca9… (patch)
- github.com/coopcycle/coopcycle-web/releases/tag/v6.20.0 (release-notes)
- github.com/coopcycle/coopcycle-web/blob/v6.19.1/config/packages/security.yaml (technical-description)
- github.com/coopcycle/coopcycle-web/blob/v6.19.1/src/Integration/Zelty/ZeltyCata… (technical-description)
- www.vulncheck.com/advisories/coopcycle-coopcycle-web-5.6.0-before-6.20.0-missin… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121620?
- CVE-2026-121620 is a medium-severity vulnerability in Coopcycle Coopcycle-Web, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2026-11-04.
- How severe is CVE-2026-121620?
- Medium severity. CVSS v3 base score is 6.5 out of 10.