A cross-site scripting (XSS) vulnerability has been identified in SourceCodester Modern Image Gallery App version 1.0. This flaw allows attackers to inject malicious JavaScript code into the application via manipulation of the 'filename' parameter within the file upload functionality. Successful exploitation could lead to session hijacking, defacement, or redirection to malicious websites, impacting users of the application. A public proof-of-concept is available.
The XSS vulnerability in Modern Image Gallery App arises from insufficient input validation when handling file uploads. An attacker can craft a malicious filename containing JavaScript code and upload it through the application's file upload feature. When a user views the uploaded file or a page displaying information about it, the injected JavaScript code will execute in their browser context. This allows the attacker to steal session cookies, redirect the user to a phishing site, or modify the content of the page, potentially compromising sensitive data or the integrity of the application. The remote nature of the exploit significantly expands the potential attack surface.
This vulnerability is publicly disclosed and a proof-of-concept exploit is available, indicating a higher likelihood of exploitation. The vulnerability has been added to the CISA KEV catalog. Given the ease of exploitation and the public availability of a PoC, attackers are likely to actively target vulnerable installations of Modern Image Gallery App.
Exploit Status
EPSS
0.03% (9% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-3070 is to upgrade to a patched version of Modern Image Gallery App. As no fixed version is specified, thoroughly review the vendor's release notes for updates addressing input validation in the file upload functionality. If upgrading is not immediately feasible, consider implementing a Web Application Firewall (WAF) rule to filter out potentially malicious filenames containing JavaScript code. Additionally, carefully scrutinize all uploaded files for suspicious content before displaying them to users. Monitor application logs for unusual activity related to file uploads. After upgrade, confirm by attempting a file upload with a known malicious filename and verifying that the JavaScript code is not executed.
Update the Modern Image Gallery App to a version later than 1.0 or apply a patch that corrects the Cross-Site Scripting (XSS) vulnerability in the upload.php file. Validate and sanitize user inputs, especially the filename, to prevent the injection of malicious code. Implement additional security measures, such as using Content Security Policy (CSP), to mitigate the risk of XSS.
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CVE-2026-3070 is a cross-site scripting (XSS) vulnerability in Modern Image Gallery App version 1.0, allowing attackers to inject malicious JavaScript code via file uploads.
If you are using Modern Image Gallery App version 1.0, you are potentially affected by this vulnerability. Upgrade to a patched version as soon as possible.
The recommended fix is to upgrade to a patched version of Modern Image Gallery App. Review vendor release notes for details. Implement WAF rules as a temporary workaround.
Yes, a public proof-of-concept is available, indicating a high probability of active exploitation.
Refer to the SourceCodester website and security advisories for updates and official information regarding CVE-2026-3070.
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