Security researchers at Google and Microsoft say they have evidence that hackers backed by China are exploiting a zero-day bug in Microsoft SharePoint, as companies around the world scramble to patch the flaw.
The bug, known officially as CVE-2025-53770 and discovered last weekend, allows hackers to steal sensitive private keys from self-hosted versions of SharePoint, a software server widely used by companies and organizations to store and share internal documents. Once exploited, an attacker can use the bug to remotely plant malware and gain access to the files and data stored within, as well as gain access to other systems on the same network.
The attack exploits SharePoint vulnerabilities originally disclosed at a Berlin hacking competition in May, where a Vietnamese cybersecurity researcher received a $100,000 bounty for discovering the flaws. Reuters reported that Microsoft was allegedly informed of the vulnerabilities in May but failed to fully address them in an initial July patch
And
Several cybersecurity experts compared the SharePoint campaign to the 2021 Microsoft Exchange server attacks that compromised US government systems. Former FBI Cyber Unit deputy director Cynthia Kaiser warned that hackers “already in their systems may lie dormant for extended periods before operationalizing”
Just shows in what a poor position US is now. Allies discovered it, reported it, feds didn’t prepare for it and Chinese are in. Incredible incompetence except for US allies that despite US’ isolationism still care.
Yeah; allies still care because of the US military industrial complex. Compromising the US still compromises a large chunk of the world, making things even worse for everyone than the current US administration can do on its own.
And the rest of the world are not petulant children ready and willing to remove any semblance of cooperation, appreciation or decency.
SharePoint is a nightmare. 😥
Micro$oft is a nightmare.
Heck, all of big tech is a nightmare.
Agree. I work with an org that uses SharePoint, I don’t. When they share docs with me, I can’t directly transfer (or maybe I haven’t found how) to One drive. I mean, they are both MS Cloud. Why?
This is what you get when you don’t patch your shit after being told about it MONTHS before it was demonstrated, and MONTHS after.
Even then this clearly effects US’ federal government so all this talk of domestic security for bringing back businesses to US are quite laughable with this context.
All what?
This is a zero-day bug though?
Read the article
I did… It looks like the bug has been exploited for a couple of weeks now, with a patch only being released on 20th of July? That makes it zero-day
The bug is regarded as a zero-day because the vendor — Microsoft, in this case — had no time to issue a patch before it was actively exploited.
Edit: realised we might have different definition of zero day. Depends whether you consider that the vendor didn’t know about the issue, or there isn’t a patch available upon exploitation of the vulnerability.
I have been dealing with this the last couple of days, Microsofts incompetence never fails to impress.
When I say things like, “Use linux, the attack surface is much smaller”, people say, “well, that won’t last forever”, to which I say, “if a trillion dollar company can drop the ball like this, I’m taking the route less travelled because society doesn’t change quickly, Microsoft isn’t going anywhere in my forseeable future”
