CVE-2021-27760 HCL Notes 11.0 - 11.0.1 FP4 Sametime Embedded chat clients are vulnerable to group chats loading script on restart
An authenticated user can execute arbitrary JavaScript code on another user's HCL Notes client via a specially crafted chat message.
- 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
- None listed
What is CVE-2021-27760?
CVE-2021-27760 is a medium-severity cross-site scripting vulnerability in HCL Notes, published on 6 May 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.
Weakness: CWE-20
Which versions are affected by CVE-2021-27760?
It affects 1 product.
Products include Hcltech Hcl Inotes.
How do I fix CVE-2021-27760?
No fix has been published for CVE-2021-27760 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-2021-27760 being exploited?
There is no known exploitation of CVE-2021-27760 in the wild and no public exploit code.
Other vulnerabilities in HCL Notes
Sources
Also known as GHSA-xcf3-q63w-pqpj.