Platform
wordpress
Component
webstack
Fixed in
1.2024.1
1.2024.1
CVE-2026-1555 represents an arbitrary file access vulnerability discovered within the WebStack theme for WordPress. This flaw allows unauthenticated attackers to upload files to the server, potentially enabling remote code execution. The vulnerability affects versions of the WebStack theme up to and including 1.2024. As of the publication date, no official patch has been released to address this security issue.
CVE-2026-1555 in the WebStack WordPress theme presents a critical security risk for websites using it. The missing file type validation within the ioimgupload() function allows unauthenticated attackers to upload arbitrary files to the server. This means an attacker could upload a malicious file, such as a web shell, enabling them to execute code on the server, potentially compromising the entire WordPress installation, including sensitive user data and website integrity. The vulnerability affects all versions of the theme up to and including 1.2024, indicating a broad base of potentially vulnerable websites. The severity is compounded by the absence of a fix, demanding immediate action to mitigate the risk.
Exploitation of CVE-2026-1555 is relatively straightforward for an attacker with basic knowledge. As authentication is not required, an attacker can simply send an HTTP request with a malicious file disguised as an image. The lack of file type validation allows the attacker to upload any file type, not just images. Once the file is successfully uploaded, the attacker can attempt to access it via a web browser or use other techniques to execute the malicious code. The absence of an official fix increases the risk of exploitation, as attackers can take advantage of the vulnerability without fear of easy detection or blocking.
Exploit Status
EPSS
0.15% (35% percentile)
CISA SSVC
CVSS Vector
Given that no official fix is provided by the WebStack theme developer, mitigating CVE-2026-1555 requires alternative measures. The primary recommendation is to deactivate and delete the WebStack theme immediately. If using the theme is absolutely necessary, consider implementing firewall rules (WAF) that block the upload of files with dangerous extensions or implement stricter file type validation at the server level. Furthermore, it's crucial to keep the rest of your WordPress installation, including plugins and the core, updated to the latest versions to reduce the attack surface. Monitoring server logs for suspicious activity can also help detect and respond to potential exploitation attempts.
No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
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It means an attacker can upload any type of file to the server, not just images, which can lead to the execution of malicious code.
If you are using the WebStack theme in a version prior to 1.2024, your website is vulnerable. Check the theme version in your WordPress admin dashboard.
Implement firewall rules (WAF) to block the upload of dangerous files and monitor server logs for suspicious activity.
Currently, there are no specific tools to detect this vulnerability, but you can use a WordPress vulnerability scanner to look for insecure configurations.
A web shell is a script that allows an attacker to execute commands on the server through a web browser.
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