CVE-2021-21666 Cross-site scripting in Jenkins Kiuwan Plugin
Reflected XSS in Jenkins Kiuwan Plugin allows attackers to execute arbitrary scripts in victim browsers via unescaped query parameters.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-21666?
CVE-2021-21666 is a medium-severity cross-site scripting vulnerability in Jenkins Kiuwan Plugin, published on 10 Jun 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
Jenkins Kiuwan Plugin 1.6.0 and earlier does not escape query parameters in an error message for a form validation endpoint, resulting in a reflected cross-site scripting (XSS) vulnerability.
Weakness: CWE-79
Which versions are affected by CVE-2021-21666?
2 open source packages ship an affected version, including org.jenkins-ci.plugins:kiuwanJenkinsPlugin. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.plugins:kiuwanJenkinsPlugin Maven | All versions | 1.6.1 |
org.jenkins-ci.plugins:kiuwanJenkinsPlugin Maven | All versions | 1.6.1 |
Products include Jenkins Kiuwan.
How do I fix CVE-2021-21666?
Upgrade org.jenkins-ci.plugins:kiuwanJenkinsPlugin to 1.6.1 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-2021-21666 being exploited?
There is no known exploitation of CVE-2021-21666 in the wild and no public exploit code.
Sources
Also known as GHSA-8h77-3xwr-hqhh.