CVE-2021-39391 Cross-site Scripting in Beego

What is CVE-2021-39391?

CVE-2021-39391 is a medium-severity cross-site scripting vulnerability in n/a, published on 14 Sep 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Cross Site Scripting (XSS) vulnerability exists in the admin panel in Beego v2.0.1 via the URI path in an HTTP request, which is activated by administrators viewing the "Request Statistics" page.

Weakness: CWE-79

Which versions are affected by CVE-2021-39391?

2 open source packages ship an affected version, including github.com/beego/beego/v2. It affects 1 product.

Products include Beego Beego.

How do I fix CVE-2021-39391?

Upgrade github.com/beego/beego/v2 to 2.0.2 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-2021-39391 being exploited?

There is no known exploitation of CVE-2021-39391 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2022-31836 Path Traversal in Beego Critical 9.8
• CVE-2022-31259 Access control bypass in beego Critical 9.8
• CVE-2021-30080 Access control bypass in Beego Critical 9.8
• CVE-2025-30223 Beego allows Reflected/Stored XSS in Beego's RenderForm() Function Due to Unescaped User Input Critical 9.3
• CVE-2024-40464 Beego privilege escalation vulnerability High 8.8

Sources

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

Also known as GHSA-c77f-4rgj-jfr4.