CVE-2025-51503 Microweber Has Stored XSS Vulnerability in User Profile Fields

What is CVE-2025-51503?

CVE-2025-51503 is a high-severity cross-site scripting vulnerability in Microweber Microweber, published on 31 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A Stored Cross-Site Scripting (XSS) vulnerability in Microweber CMS 2.0 allows attackers to inject malicious scripts into user profile fields, leading to arbitrary JavaScript execution in admin browsers.

Weakness: CWE-79

Which versions are affected by CVE-2025-51503?

2 open source packages ship an affected version, including microweber/microweber. It affects 1 product.

Products include Microweber Microweber.

How do I fix CVE-2025-51503?

No fix has been published for CVE-2025-51503 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-51503 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-51503 exists.

Other vulnerabilities in Microweber Microweber

• CVE-2022-0558 Cross-site Scripting (XSS) - Stored in microweber/microweber Critical 9.8
• CVE-2020-23138 File upload in n/a Critical 9.8
• CVE-2022-0688 Business Logic Errors in microweber/microweber Critical 9.4
• CVE-2022-0660 Generation of Error Message Containing Sensitive Information in microweber/microweber Critical 9.4
• CVE-2022-0913 Integer Overflow or Wraparound in microweber/microweber Critical 9.1

All Microweber Microweber vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-782f-gxj5-xvqc.