CVE-2026-45644 Microsoft Live Share Canvas SDK Elevation of Privilege Vulnerability
An authorized attacker can exploit a cross-site scripting flaw in the Microsoft Live Share Canvas SDK to elevate privileges over the network.
- 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-2026-45644?
CVE-2026-45644 is a high-severity cross-site scripting vulnerability in Microsoft Live Share Canvas SDK, published on 9 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Live Share Canvas SDK allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-79
Which versions are affected by CVE-2026-45644?
It affects 1 product.
Products include Microsoft Live Share Canvas.
How do I fix CVE-2026-45644?
No fix has been published for CVE-2026-45644 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-2026-45644 being exploited?
There is no known exploitation of CVE-2026-45644 in the wild and no public exploit code.
Sources
Also known as GHSA-pc2q-pf7r-rf2w.