CVE-2026-25438
Reflected XSS in ThemeHunk Gutenberg Blocks
Publication date: 2026-03-19
Last updated on: 2026-04-23
Assigner: Patchstack
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| themehunk | gutenberg_blocks | From 1.0.0 (inc) to 1.2.8 (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
Can you explain this vulnerability to me?
CVE-2026-25438 is a Cross Site Scripting (XSS) vulnerability found in the WordPress Gutenberg Blocks Plugin versions up to and including 1.2.8.
This vulnerability allows attackers to inject malicious scripts, such as redirects, advertisements, or other HTML payloads, into websites. These scripts execute when visitors access the compromised site.
Exploitation requires user interaction, such as clicking a malicious link, visiting a crafted page, or submitting a form, but no authentication is required to initiate the attack.
It falls under the OWASP Top 10 category A3: Injection and is specifically classified as Reflected Cross Site Scripting.
How can this vulnerability impact me? :
[{'type': 'paragraph', 'content': 'This vulnerability can lead to attackers injecting malicious scripts into your website, which can execute when visitors access your site.'}, {'type': 'list_item', 'content': 'Attackers can redirect visitors to malicious sites.'}, {'type': 'list_item', 'content': 'Attackers can display unwanted advertisements or malicious HTML content.'}, {'type': 'list_item', 'content': 'It can compromise the integrity and trustworthiness of your website.'}, {'type': 'paragraph', 'content': "Because no authentication is required to exploit this vulnerability, it can be widely targeted in mass campaigns regardless of your site's traffic or popularity."}] [1]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
The vulnerability is a reflected Cross Site Scripting (XSS) issue in the WordPress Gutenberg Blocks Plugin up to version 1.2.8. Detection typically involves monitoring for suspicious input that is improperly neutralized and reflected back in web pages.
While no specific detection commands are provided, common approaches include using web vulnerability scanners that test for reflected XSS by injecting typical XSS payloads into input fields or URLs and observing if the payload is executed or reflected unescaped.
Additionally, monitoring web server logs for unusual query strings or payloads that include script tags or suspicious HTML can help identify attempted exploitation.
Since exploitation requires user interaction such as clicking a malicious link or submitting a crafted form, analyzing user activity and input validation failures may also assist in detection.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include applying any official patches released for the Gutenberg Blocks Plugin as soon as they become available.
If no patch is available, it is strongly recommended to apply Patchstack’s mitigation rules, which can block attacks targeting this vulnerability until an official fix is released.
Consulting with hosting providers or web developers to implement additional security measures, such as input validation, web application firewalls (WAF), or disabling vulnerable plugin features, can also reduce risk.
Users should also educate privileged users to avoid clicking suspicious links or submitting untrusted forms to minimize exploitation chances.