Medium severity6.5NVD Advisory· Published Nov 4, 2026
CVE-2026-121620
CVE-2026-121620
Description
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <6.20.0
Patches
Vulnerability mechanics
References
5- github.com/coopcycle/coopcycle-web/blob/v6.19.1/config/packages/security.yamlnvd
- github.com/coopcycle/coopcycle-web/blob/v6.19.1/src/Integration/Zelty/ZeltyCatalogProcessor.phpnvd
- github.com/coopcycle/coopcycle-web/commit/9b499950d433ca8ba894996d6b17f49885ca9485nvd
- github.com/coopcycle/coopcycle-web/releases/tag/v6.20.0nvd
- www.vulncheck.com/advisories/coopcycle-coopcycle-web-5.6.0-before-6.20.0-missing-zelty-webhook-signature-verificationnvd
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