Known Vulnerabilities for Activitypub by Automattic

Listed below are 5 of the newest known vulnerabilities associated with "Activitypub" by "Automattic".

These CVEs are retrieved based on exact matches on listed software, hardware, and vendor information (CPE data) as well as a keyword search to ensure the newest vulnerabilities with no officially listed software information are still displayed.

Data on known vulnerable versions is also displayed based on information from known CPEs

Known Vulnerabilities

CVE Shortened Description Severity Publish Date Last Modified
CVE-2026-34148 json Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to 1.9.6, 1.10.5, 2.0.8, and ... Not Provided 2026-04-06 2026-04-07
CVE-2026-33869 json Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 an... Not Provided 2026-03-27 2026-03-27
CVE-2026-33868 json Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.5.8, 4.4.15, and 4.3.21, an u... Not Provided 2026-03-27 2026-03-31
CVE-2026-33693 json Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the `v4_is_invalid()` function in `act... Not Provided 2026-03-27 2026-03-30
CVE-2026-4338 json The ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated users t... Not Provided 2026-04-08 2026-04-08
CVE-2023-5057 json The ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could a... 5.4 - MEDIUM 2023-10-16 2023-11-07
CVE-2023-3746 json The ActivityPub WordPress plugin before 1.0.0 does not sanitize and escape some data from post content, which could allow con... 5.4 - MEDIUM 2023-10-16 2023-11-07
CVE-2023-3707 json The ActivityPub WordPress plugin before 1.0.0 does not ensure that post contents to be displayed are public and belong to the... 4.3 - MEDIUM 2023-10-16 2023-11-07
CVE-2023-3706 json The ActivityPub WordPress plugin before 1.0.0 does not ensure that post titles to be displayed are public and belong to the p... 4.3 - MEDIUM 2023-10-16 2023-11-07
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