CVE-2026-33143

OneUptime: WhatsApp Webhook Missing Signature Verification

State: Published
Severity: 8.7 High
Published: Mar 20, 2026
Updated: Mar 24, 2026
Reserved: Mar 17, 2026

Description

OneUptime is a solution for monitoring and managing online services. Prior to version 10.0.34, the WhatsApp POST webhook handler (/notification/whatsapp/webhook) processes incoming status update events without verifying the Meta/WhatsApp X-Hub-Signature-256 HMAC signature, allowing any unauthenticated attacker to send forged webhook payloads that manipulate notification delivery status records, suppress alerts, and corrupt audit trails. The codebase already implements proper signature verification for Slack webhooks. This issue has been patched in version 10.0.34.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
oneuptimeOneUptime	< 10.0.34Affected

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-g5ph-f57v-mwjc

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