What’s Vulnerable › Vulnerabilities
CVE-2026-33143: OneUptime: WhatsApp Webhook Missing Signature Verification
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-20 · updated 2026-10-07
- Weakness: CWE-345
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.
Affected products
- oneuptime: before 10.0.34 — fixed in 10.0.34
How to fix
Upgrade to a fixed version: oneuptime 10.0.34. Check the vendor advisory for mitigations.
References
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