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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
OneUptime oneuptime affected
Version Status Constraints
< 10.0.34 affected —

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Project Subscriptions

No data.

Advisories
Source ID Title
Github GHSA Github GHSA GHSA-g5ph-f57v-mwjc OneUptime WhatsApp Webhook Missing Signature Verification
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/OneUptime/oneuptime/security/advisories/GHSA-g5ph-f57v-mwjc cve-icon cve-icon
History

Fri, 20 Mar 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title OneUptime: WhatsApp Webhook Missing Signature Verification
Weaknesses CWE-345
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-20T20:05:13.690Z

Reserved: 2026-03-17T20:35:49.929Z

Link: CVE-2026-33143

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-20T21:17:14.933

Modified: 2026-03-20T21:17:14.933

Link: CVE-2026-33143

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses