Google, Microsoft say Chinese hackers are exploiting SharePoint zero-day
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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.
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.
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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.
This is a zero-day bug though?
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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.
I have been dealing with this the last couple of days, Microsofts incompetence never fails to impress.
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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.
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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.
SharePoint is a nightmare.
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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.
That’s not a zero-day… Really dislike media that waters down or misuse terminology
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That’s not a zero-day… Really dislike media that waters down or misuse terminology
Well, it's a zero day for 24 hours, right?
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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.
almost makes one forget this is a problem that Microsoft created.
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Well, it's a zero day for 24 hours, right?
Yepp - it was, but that day was 11. June
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Yepp - it was, but that day was 11. June
I don't think that's true either, based on the reporting it's based on a bug disclosed at a hacking conference in May. No clue how this is a zero day if it's based on a 2 month old bug reported to the vendor.
Seems more like bog standard Microsoft fucking around and waiting too long to patch before it got used.
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I don't think that's true either, based on the reporting it's based on a bug disclosed at a hacking conference in May. No clue how this is a zero day if it's based on a 2 month old bug reported to the vendor.
Seems more like bog standard Microsoft fucking around and waiting too long to patch before it got used.
Iirc there was a previous attempt to patch this, it would appear a slight variation was not fixed in the patch. Might be why people are saying zero day.
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That’s not a zero-day… Really dislike media that waters down or misuse terminology
It's not just media. The number of software engineers I've heard talk about "fixing" a "zero day" in a code dependency by updating to a patched version...
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This is a zero-day bug though?
Read the article
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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?
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That’s not a zero-day… Really dislike media that waters down or misuse terminology
So that would make it a zero-oneandahalf-week.
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almost makes one forget this is a problem that Microsoft created.
Well yes these type of things can happen to virtually any type of complex software to anyone. Though the lacking response is concerning.
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This is a zero-day bug though?
It's not, the title lies.
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SharePoint 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?
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Well yes these type of things can happen to virtually any type of complex software to anyone. Though the lacking response is concerning.
concerning
Or a trend.
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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.
