CVE-2025-62459 Microsoft Defender Portal Spoofing Vulnerability
Attackers can spoof the Microsoft Defender Portal interface, potentially misleading users and bypassing security controls.
- 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-2025-62459?
CVE-2025-62459 is a high-severity cross-site scripting vulnerability in Microsoft 365 Defender Portal, published on 20 Nov 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
Microsoft Defender Portal Spoofing Vulnerability
Weakness: CWE-79
Which versions are affected by CVE-2025-62459?
It affects 1 product.
Products include Microsoft 365 Defender Portal.
How do I fix CVE-2025-62459?
No fix has been published for CVE-2025-62459 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-2025-62459 being exploited?
There is no known exploitation of CVE-2025-62459 in the wild and no public exploit code.
Sources
Also known as GHSA-6fq4-36mv-2v76.