WP OAuth Server (OAuth Authentication) vulnerabilities
Plugin slug oauth2-provider · 8 known vulnerabilities · latest disclosed 2026-09-30 · WordPress.org page
Every listed vulnerability has a fix. Version 4.5.2 or later is not affected by any of them. If your site runs an older version, update it.
2 of 8 rated high or critical (CVSS 7 or more).
Known vulnerabilities in WP OAuth Server (OAuth Authentication)
| Severity | Affected versions | Fixed in | CVE | Published | Details |
|---|---|---|---|---|---|
| Medium 6.4 | <= 4.5.1 | 4.5.2 | CVE-2026-97288 | 2026-09-30 | Advisory |
| Medium 5.4 | <= 4.3.3 | 4.4.0 | CVE-2024-31253 | 2024-04-05 | Advisory |
| Medium 4.3 | <= 4.2.5 | 4.3.0 | CVE-2022-4148 | 2023-02-21 | Advisory |
| Medium 6.5 | <= 4.2.3 | 4.2.5 | CVE-2022-3894 | 2023-02-21 | Advisory |
| Medium 5.4 | <= 4.2.5 | 4.3.0 | none | 2023-01-26 | Advisory |
| High 8.8 | <= 4.2.5 | 4.3.0 | CVE-2022-3926 | 2022-11-10 | Advisory |
| Medium 5.5 | <= 4.2.1 | 4.2.2 | CVE-2022-3892 | 2022-11-08 | Advisory |
| Critical 9.8 | < 3.1.5 | 3.1.5 | CVE-2015-9435 | 2015-08-12 | Advisory |
Check if a site is affected
Enter a site address to see which version of WP OAuth Server (OAuth Authentication) and other plugins it runs, and whether they match a known vulnerability.
Questions
Is the WP OAuth Server (OAuth Authentication) plugin safe to use?
All 8 known issues are fixed in current versions (4.5.2 or later). Keeping it updated is what matters.
How do I check which version of WP OAuth Server (OAuth Authentication) my site runs?
In WordPress go to Plugins > Installed Plugins. From the outside, the free PluginPeek scan below reads the version from the site's public files.
How do I fix a vulnerable plugin?
Make a full backup, then update it from Dashboard > Updates and check the site afterwards. If you would rather not, we can do it for a fixed $99, paid after you have checked the site.