CVE-2018-20807 Cross-site scripting in n/a
Attackers can execute arbitrary scripts in user browsers via unsanitized URL parameters in the welcome.cgi interface of Pulse Secure PCS.
- 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
- None listed
What is CVE-2018-20807?
CVE-2018-20807 is a medium-severity cross-site scripting vulnerability in Ivanti Connect Secure, published on 16 Mar 2019. 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
An XSS issue has been found in welcome.cgi in Pulse Secure Pulse Connect Secure (PCS) 8.1.x before 8.1R12, 8.2.x before 8.2R9, and 8.3.x before 8.3R3 due to one of the URL parameters not being sanitized properly.
Weakness: CWE-79
Which versions are affected by CVE-2018-20807?
It affects 1 product.
Products include Ivanti Connect Secure.
How do I fix CVE-2018-20807?
No fix has been published for CVE-2018-20807 yet. Limit exposure of the affected software until one is available.
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-2018-20807 being exploited?
There is no known exploitation of CVE-2018-20807 in the wild and no public exploit code.
Other vulnerabilities in Ivanti Connect Secure
- CVE-2021-22893 Ivanti Pulse Connect Secure Use-After-Free
- CVE-2019-11510 Ivanti Pulse Connect Secure Arbitrary File Read
- CVE-2024-21887 Ivanti Connect Secure and Policy Secure Command Injection
- CVE-2025-22457 Ivanti Connect Secure, Policy Secure, and ZTA Gateways Stack-Based Buffer Overflow
- CVE-2025-0282 Ivanti Connect Secure, Policy Secure, and ZTA Gateways Stack-Based Buffer Overflow
Sources
Also known as GHSA-7xqg-h9pv-h2hr.