CVE-2026-4801
Stored XSS in CoBlocks Gutenberg Events Block via iCal Feed
Publication date: 2026-04-18
Last updated on: 2026-04-18
Assigner: Wordfence
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| goatgroup | coblocks | to 3.1.16 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The vulnerability allows authenticated attackers with Contributor-level access and above to inject arbitrary web scripts via stored cross-site scripting (XSS) in pages. This could potentially lead to unauthorized access or manipulation of user data when those pages are accessed.
Such unauthorized script execution can compromise the confidentiality and integrity of user data, which may impact compliance with data protection regulations like GDPR and HIPAA that require safeguarding personal and sensitive information.
However, the provided information does not explicitly detail the direct impact on compliance with these standards.
Can you explain this vulnerability to me?
The vulnerability exists in the Page Builder Gutenberg Blocks – CoBlocks plugin for WordPress, specifically in all versions up to and including 3.1.16. It is a Stored Cross-Site Scripting (XSS) issue caused by insufficient output escaping of event titles, descriptions, and locations that are fetched from external iCal feeds in the Events block rendering function.
This flaw allows authenticated attackers with Contributor-level access or higher to inject arbitrary web scripts into pages. These scripts will execute whenever any user accesses the injected page.
How can this vulnerability impact me? :
This vulnerability can lead to the execution of malicious scripts on your website by attackers who have Contributor-level access or above. The impact includes the potential compromise of user sessions, theft of sensitive information, defacement of web pages, or redirection to malicious sites.
Since the vulnerability is a Stored Cross-Site Scripting issue, the malicious code is permanently stored on the affected site and executed every time a user views the infected page, increasing the risk and reach of the attack.