CVE-2025-55321 Azure Monitor Log Analytics Spoofing Vulnerability
An attacker can perform spoofing attacks via cross-site scripting in Azure Monitor, potentially compromising user trust and session integrity.
- 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-2025-55321?
CVE-2025-55321 is a critical cross-site scripting vulnerability in Microsoft Azure Monitor, published on 9 Oct 2025. 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
Improper neutralization of input during web page generation ('cross-site scripting') in Azure Monitor allows an unauthorized attacker to perform spoofing over a network.
Weakness: CWE-79
Which versions are affected by CVE-2025-55321?
It affects 1 product.
Products include Microsoft Azure Monitor.
How do I fix CVE-2025-55321?
No fix has been published for CVE-2025-55321 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-2025-55321 being exploited?
There is no known exploitation of CVE-2025-55321 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Azure Monitor
Sources
Also known as GHSA-96rv-gm93-8wx5.