CVE-2026-33143 OneUptime: WhatsApp Webhook Missing Signature Verification
Attackers can forge WhatsApp webhook payloads to manipulate notification statuses and suppress alerts due to missing signature verification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33143?
CVE-2026-33143 is a high-severity missing authorization vulnerability in oneuptime, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-345
Which versions are affected by CVE-2026-33143?
2 open source packages ship an affected version, including oneuptime. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
oneuptime npm | All versions | 10.0.34 |
oneuptime npm | All versions | 10.0.34 |
Products include Hackerbay Oneuptime.
How do I fix CVE-2026-33143?
Upgrade oneuptime to 10.0.34 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-33143 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33143 exists.
Other vulnerabilities in oneuptime
- CVE-2026-33396 Code injection in oneuptime
- CVE-2026-32306 OneUptime ClickHouse SQL Injection via Aggregate Query Parameters
- CVE-2026-30956 OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header
- CVE-2026-30957 OneUptime Synthetic Monitor RCE via exposed Playwright browser object
- CVE-2026-30887 OneUptime Affected by Unsandboxed Code Execution in Probe Allows Any Project Member to Achieve RCE
Sources
Also known as GHSA-g5ph-f57v-mwjc.