CVE-2021-39136 Cross-site scripting vulnerability in file upload

What is CVE-2021-39136?

CVE-2021-39136 is a high-severity cross-site scripting vulnerability in Basercms Basercms, published on 25 Aug 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

baserCMS is an open source content management system with a focus on Japanese language support. In affected versions there is a cross-site scripting vulnerability in the file upload function of the management system of baserCMS. Users are advised to update as soon as possible. No workaround are available to mitigate this issue.

Weakness: CWE-79

Which versions are affected by CVE-2021-39136?

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

Products include Basercms Basercms.

How do I fix CVE-2021-39136?

Upgrade baserproject/basercms to 4.5.1 or later.

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-2021-39136 being exploited?

There is no known exploitation of CVE-2021-39136 in the wild and no public exploit code.

Other vulnerabilities in Basercms Basercms

• CVE-2023-25654 baserCMS File Uploader Remote Code Execution (RCE) vulnerability Critical 9.8
• CVE-2023-25655 baserCMS allows any file to be uploaded Critical 9.8
• CVE-2017-10842 baserCMS SQL Injection vulnerability Critical 9.8
• CVE-2026-30880 baserCMS: OS command injection vulnerability in installer Critical 9.2
• CVE-2026-21861 baserCMS: OS Command Injection Leading to Remote Code Execution (RCE) Critical 9.1

All Basercms Basercms vulnerabilities

Sources

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

Also known as GHSA-hgjr-632x-qpp3.