PatchSiren cyber security CVE debrief
CVE-2021-47927 Wpsymposiumpro CVE debrief
CVE-2021-47927 is a stored cross-site scripting vulnerability in the WordPress plugin WP Symposium Pro 2021.10. The supplied description says an authenticated attacker can send a crafted POST request to the admin setup page using the wps_admin_forum_add_name parameter, where insufficient sanitization allows a malicious script to be stored and later executed when the forum is viewed. NVD lists the issue as CVSS 5.1 Medium.
- Vendor
- Wpsymposiumpro
- Product
- Unknown
- CVSS
- MEDIUM 5.1
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-05-10
- Original CVE updated
- 2026-05-10
- Advisory published
- 2026-05-10
- Advisory updated
- 2026-05-10
Who should care
WordPress site administrators, security teams, and hosting operators running WP Symposium Pro 2021.10 should care most. Any environment where untrusted or lower-privileged authenticated users can reach the plugin’s forum/admin setup workflow is potentially exposed, and anyone viewing affected forum pages could be impacted by stored script execution.
Technical summary
The vulnerability is categorized as CWE-79 (cross-site scripting). The supplied NVD record describes a network-reachable issue with low attack complexity, low privileges required, and user interaction required (CVSS v4 vector includes AV:N, AC:L, PR:L, UI:P). The flaw is in the plugin’s handling of the forum name parameter: attacker-supplied input is not sufficiently sanitized before storage and later rendering, enabling stored XSS in the forum interface.
Defensive priority
Medium. Treat as a routine but important plugin remediation item: prioritize it if WP Symposium Pro is installed and actively used, or if the site exposes administrative or forum-management functions broadly.
Recommended defensive actions
- Verify whether WP Symposium Pro is installed and confirm the deployed version.
- Upgrade or remove WP Symposium Pro 2021.10 if an affected release is present.
- Restrict access to WordPress admin and plugin setup pages to trusted administrators only.
- Review recent forum-name or setup submissions for unexpected HTML or script-like content.
- Check affected forum pages for signs of stored markup abuse and clear any cached copies after remediation.
- Monitor for unusual admin activity or session misuse after fixing the plugin.
Evidence notes
This debrief is based only on the supplied corpus: the NVD record, the CVE description, and the listed references. The corpus states that CVE-2021-47927 is a stored XSS in WP Symposium Pro 2021.10 involving the wps_admin_forum_add_name parameter, and it assigns CWE-79 with CVSS 5.1 Medium. The provided enrichment marks the case as not in CISA KEV. The timeline fields in the prompt are used as catalog timing context only and not as the original issue date.
Official resources
Publicly cataloged in the supplied NVD record and associated VulnCheck references; the provided enrichment does not list this CVE in CISA KEV.