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As of 10/26/2026, discourse-activity-pub recorded 1 security vulnerability in the last 90 days, of which 1 is rated High or Critical. None of these vulnerabilities is actively exploited (KEV) according to CISA's catalog. CyStack recommends that organizations and individual users apply patches as soon as possible.
CyStack does not yet have sufficient official-source data to identify the latest version of discourse-activity-pub and determine which vulnerabilities affect that version.
CyStack VulnScan continuously discovers assets, validates vulnerabilities, and helps security teams prioritize remediation across the organization.
CVE-2026-55103Discourse ActivityPub: Fix inbound actor validation and apply outbound request SSRF hardening| Vulnerability | Exploitation status | Fix | Published | Severity |
|---|---|---|---|---|
CVE-2026-55103Discourse ActivityPub: Fix inbound actor validation and apply outbound request SSRF hardening | Exploitation statusNot confirmed | FixNo | Published10/15/2026 | SeverityHigh |
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