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OneSignal vulnerabilities
OneSignal has 3 known vulnerabilities in this database. The most recent published record is dated 16 Apr 2026.
- Known vulnerabilities
- 3
- Active installs
- 60,000+
- Latest version
- 3.9.4
- Last updated
- 29 Sep 2026
- Most recent
- 16 Apr 2026
Find it in your WordPress dashboard under Plugins. Severity is based on the CVSS score published with the CVE where one is available.
| Vulnerability | Severity | Affected | Fix | Published |
|---|---|---|---|---|
| Broken access control CVE-2026-3155 | Low 3.1 | Up to 3.8.0 | Fixed in a later version (latest 3.9.4) | 16 Apr 2026 |
| Broken access control CVE-2025-13950 | Medium 5.3 | Up to 3.6.1 | Fixed in a later version (latest 3.9.4) | 15 Dec 2025 |
| Cross-site scripting (XSS) CVE-2019-15827 | Medium 5.4 | Before 1.17.8 | Fixed in 1.17.8 | 30 Aug 2019 |
Read the published descriptions
- CVE-2026-3155, 16 Apr 2026
- The OneSignal - Web Push Notifications plugin for WordPress is vulnerable to authorization bypass in versions up to, and including, 3.8.0. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete OneSignal metadata for arbitrary posts. CVE record
- CVE-2025-13950, 15 Dec 2025
- The OneSignal - Web Push Notifications plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the settings handling functionality in all versions up to, and including, 3.6.1. This is due to the plugin processing POST requests without verifying user capabilities or nonces. This makes it possible for unauthenticated attackers to overwrite the OneSignal App ID, REST API key, and notification behavior via direct POST requests. CVE record
- CVE-2019-15827, 30 Aug 2019
- The onesignal-free-web-push-notifications plugin before 1.17.8 for WordPress has XSS via the subdomain parameter. CVE record
What to do if you run OneSignal
If you run OneSignal, open WordPress and check the installed version in Plugins. Compare it with the affected versions in the vulnerability record. If a fixed version is available, take a current backup and update to that version or the latest supported release.
If no fixed version exists, consider disabling and removing the plugin or replacing it with a maintained alternative. After dealing with the affected software, check administrator users, unexpected file changes, redirects, unfamiliar pages and security logs for signs that the site may already have been altered.
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