What is CVE-2026-33143?

CVE-2026-33143 is a high-severity vulnerability in Hackerbay Oneuptime, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2026-03-20.

How severe is CVE-2026-33143?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Hackerbay Oneuptime

CVE-2026-33143

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.

EPSS: 0.002 (8.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Hackerbay Oneuptime
Oneuptime — versions < 10.0.34

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33143?: CVE-2026-33143 is a high-severity vulnerability in Hackerbay Oneuptime, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2026-03-20.
How severe is CVE-2026-33143?: High severity. CVSS v3 base score is 7.5 out of 10.