CVE-2020-2257 Stored XSS vulnerability in Validating String Parameter Plugin
Stored XSS in Jenkins Validating String Parameter Plugin allows attackers with Job/Configure permission to execute scripts in other users' browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-2257?
CVE-2020-2257 is a medium-severity cross-site scripting vulnerability in Jenkins Validating String Parameter Plugin, published on 16 Sep 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Jenkins Validating String Parameter Plugin 2.4 and earlier does not escape various user-controlled fields, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.
Weakness: CWE-79
Which versions are affected by CVE-2020-2257?
2 open source packages ship an affected version, including org.jenkins-ci.plugins:validating-string-parameter. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.plugins:validating-string-parameter Maven | All versions | 2.5 |
org.jenkins-ci.plugins:validating-string-parameter Maven | All versions | 2.5 |
Products include Jenkins Validating String Parameter.
How do I fix CVE-2020-2257?
Upgrade org.jenkins-ci.plugins:validating-string-parameter to 2.5 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-2020-2257 being exploited?
There is no known exploitation of CVE-2020-2257 in the wild and no public exploit code.
Sources
Also known as GHSA-fvwh-wv43-8qj5.