CVE-2025-64677 Office Out-of-Box Experience Spoofing Vulnerability
An attacker can perform spoofing via cross-site scripting in the Office Out-of-Box Experience, requiring a patch to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-64677?
CVE-2025-64677 is a high-severity cross-site scripting vulnerability in Microsoft Office Out-of-Box Experience, published on 18 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper neutralization of input during web page generation ('cross-site scripting') in Office Out-of-Box Experience allows an unauthorized attacker to perform spoofing over a network.
Weakness: CWE-79
Which versions are affected by CVE-2025-64677?
It affects 1 product.
Products include Microsoft Office Out-of-Box Experience.
How do I fix CVE-2025-64677?
No fix has been published for CVE-2025-64677 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-2025-64677 being exploited?
There is no known exploitation of CVE-2025-64677 in the wild and no public exploit code.
Sources
Also known as GHSA-589g-82vw-vxfr.