Cross-site scripting in wpweaver Weaver Show Posts
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- High
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Weaver Show Posts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'add_class' parameter in all versions up to, and including, 1.8.1. This is due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This primarily affects multisite installations where Administrators do not have the unfiltered_html capability.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-2121
- 2026-10-03 Alias added: GHSA-qf9c-wfj4-w8fw
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/e0d525ab-a86d-4750-9d16-731cbc0a626e?source=cve
- https://plugins.trac.wordpress.org/browser/show-posts/trunk/includes/posts-widgets.php#L32
- https://plugins.trac.wordpress.org/browser/show-posts/tags/1.8.1/includes/posts-widgets.php#L32
- https://plugins.trac.wordpress.org/browser/show-posts/trunk/includes/posts-widgets.php#L45
- https://plugins.trac.wordpress.org/browser/show-posts/tags/1.8.1/includes/posts-widgets.php#L45
- https://youtu.be/kbSqUuEAyho
More wpweaver vulnerabilities
- TI-2023-04576 Weaver Xtreme Theme Support < 6.3.1 - Admin+ PHP Object Injection CVSS 3.1HIGH 7.2
- TI-2023-00261 Weaver Xtreme Theme Support < 6.2.7 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4
- TI-2026-08795 Turnkey bbPress by WeaverTheme <= 1.7.1 - Authenticated (Administrator+) PHP Object Injection CVSS 3.1MEDIUM 6.6
- TI-2023-01328 Weaver Show Posts <= 1.6 - Authenticated(Contributor+) Stored Cross-Site Scripting via Display Name CVSS 3.1MEDIUM 6.4
- TI-2023-01327 Weaver Xtreme Theme <= 5.0.7 - Authenticated(Contributor+) Stored Cross-Site Scripting via Display Name CVSS 3.1MEDIUM 6.4
- TI-2026-71538 Stored cross-site scripting in Weaver Xtreme Theme Support plugin CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-2121 · CVE Program
- CVE-2026-2121 · NVD
- FIRST EPSS
- GHSA-qf9c-wfj4-w8fw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences