CVE-2021-40369 XSS vulnerability on Denounce plugin

What is CVE-2021-40369?

CVE-2021-40369 is a medium-severity cross-site scripting vulnerability in Apache JSPWiki, published on 24 Nov 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

A carefully crafted plugin link invocation could trigger an XSS vulnerability on Apache JSPWiki, related to the Denounce plugin, which could allow the attacker to execute javascript in the victim's browser and get some sensitive information about the victim. Apache JSPWiki users should upgrade to 2.11.0 or later.

Weakness: CWE-79

Which versions are affected by CVE-2021-40369?

2 open source packages ship an affected version, including org.apache.jspwiki:jspwiki-main. It affects 1 product.

Products include Apache Jspwiki.

How do I fix CVE-2021-40369?

Upgrade org.apache.jspwiki:jspwiki-main to 2.11.0 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-2021-40369 being exploited?

There is no known exploitation of CVE-2021-40369 in the wild and no public exploit code.

Other vulnerabilities in Apache JSPWiki

• CVE-2026-28812 Apache JSPWiki: UserManager does not sanity-check user database at startup Critical 9.8
• CVE-2021-44140 Arbitrary file deletion on logout Critical 9.1
• CVE-2026-28813 Apache JSPWiki: JSPWiki vulnerable to JSON hijacking High 8.8
• CVE-2022-34158 User Group Privilege Escalation High 8.8
• CVE-2022-24947 Apache JSPWiki CSRF Account Takeover High 8.8

Sources

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

Also known as GHSA-cfqj-9g2g-w7q6.