TI-2026-00672 Aliases CVE-2026-0894 GHSA-23v6-h45q-rxch

Cross-site scripting in vanderwijk Content Blocks

LOW 28CWE-79Published 2026-04-18 · Updated 2026-04-20

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
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 Content Blocks (Custom Post Widget) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's content_block shortcode in all versions up to, and including, 3.3.9 due to insufficient input sanitization and output escaping on user supplied values consumed from user-created content blocks. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00194 9th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

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

Vendor	Product	Affected versions	Fixed in	Status	Source
vanderwijk	Content Blocks (Custom Post Widget)	up to 3.3.9	—	No fix listed	CNA

Content Blocks (Custom Post Widget) Vendorvanderwijk Affected up to 3.3.9 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:vanderwijk:content_blocks::::::::	—	—	vanderwijk

cpe:2.3:a:vanderwijk:content_blocks:*:*:*:*:*:*:*:* Versions — — ·vanderwijk

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-0894
2026-10-03 Alias added: GHSA-23v6-h45q-rxch

References

Other 2

TI-2024-03323 Content Blocks (Custom Post Widget) <= 3.3.0 - Authenticated (Contributor+) Local File Inclusion via Shortcode CVSS 3.1HIGH 8.8
TI-2024-29640 WordPress Content Blocks (Custom Post Widget) plugin <= 3.3.5 - Cross Site Scripting (XSS) vulnerability CVSS 3.1MEDIUM 6.5
TI-2024-22868 WordPress Content Blocks (Custom Post Widget) plugin <= 3.3.0 - Cross Site Scripting (XSS) vulnerability CVSS 3.1MEDIUM 6.5
TI-2024-05969 Cross-site scripting in vanderwijk Content Blocks CVSS 3.1MEDIUM 6.4
TI-2024-03324 Cross-site scripting in vanderwijk Content Blocks CVSS 3.1MEDIUM 6.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences