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ActivityPub vulnerabilities
ActivityPub has 5 known vulnerabilities in this database. The most recent published record is dated 8 Apr 2026.
- Known vulnerabilities
- 5
- Active installs
- 6,000+
- Latest version
- 9.3.1
- Last updated
- 2 Sep 2026
- Most recent
- 8 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 |
|---|---|---|---|---|
| Security weakness CVE-2026-4338 | High 7.5 | Before 8.0.2 | Fixed in 8.0.2 | 8 Apr 2026 |
| Cross-site scripting (XSS) CVE-2023-5057 | Medium 5.4 | Before 1.0.0 | Fixed in 1.0.0 | 16 Oct 2023 |
| Cross-site scripting (XSS) CVE-2023-3746 | Medium 5.4 | Before 1.0.0 | Fixed in 1.0.0 | 16 Oct 2023 |
| Security weakness CVE-2023-3706 | Medium 4.3 | Before 1.0.0 | Fixed in 1.0.0 | 16 Oct 2023 |
| Security weakness CVE-2023-3707 | Medium 4.3 | Before 1.0.0 | Fixed in 1.0.0 | 16 Oct 2023 |
Read the published descriptions
- CVE-2026-4338, 8 Apr 2026
- The ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated users to access drafts/scheduled/pending posts CVE record
- CVE-2023-5057, 16 Oct 2023
- The ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could allow users with a role of Contributor and above to perform Stored XSS attacks CVE record
- CVE-2023-3746, 16 Oct 2023
- The ActivityPub WordPress plugin before 1.0.0 does not sanitize and escape some data from post content, which could allow contributor and above role to perform Stored Cross-Site Scripting attacks CVE record
- CVE-2023-3706, 16 Oct 2023
- The ActivityPub WordPress plugin before 1.0.0 does not ensure that post titles to be displayed are public and belong to the plugin, allowing any authenticated user, such as subscriber to retrieve the title of arbitrary post (such as draft and private) via an IDOR vector CVE record
- CVE-2023-3707, 16 Oct 2023
- The ActivityPub WordPress plugin before 1.0.0 does not ensure that post contents to be displayed are public and belong to the plugin, allowing any authenticated user, such as subscriber to retrieve the content of arbitrary post (such as draft and private) via an IDOR vector. Password protected posts are not affected by this issue. CVE record
What to do if you run ActivityPub
If you run ActivityPub, 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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