Yes, the title is right. This blog covers an XML eXternal Entity (XXE) injection vulnerability that the author found in SharePoint.
The bug was recently patched by Microsoft. In general, XXE vulnerabilities are not very exciting in terms of discovery and related technical aspects. They may sometimes be fun to exploit and exfiltrate data (or do other nasty things) in real environments, but in the vulnerability research world, you typically find them, report them, and forget about them. So why the author is writing a blog post about an XXE? They have two reasons: 1. It affects SharePoint, both on-prem and cloud instances, which is a nice target. This vulnerability can be exploited by a low-privileged user. 2. This is one of the craziest XXEs that they have ever seen (and found), both in terms of vulnerability discovery and the method of triggering.
Read more…
Source: Zero Day Initiative
Related:
- Top AI tools such as OpenClaw and Github Copilot can be hijacked to create new massive botnets
July 15, 2026
Your favorite AI service could be subverted to deploy code that turns your phone or PC into a botnet, according to researchers at Intuit, Technion, and Tel Aviv University. The technique has been given the name HalluSquatting, a portmanteau of adversarial hallucination squatting, and is similar to typosquatting in that it relies on a mistake in ...
- Microsoft tops last month’s record with 622 Patch Tuesday CVEs
July 14, 2026
Remember last month when we were awed by Microsoft’s record-setting Patch Tuesday that addressed 206 CVEs? That was a quaint era compared to this month: Redmond just rolled out patches for 622 CVEs specific to its products, slightly more than tripling last month’s all-time high. Redmond’s Patch Tuesday release is once again one for the record books, with everything under ...
- Two Chrome updates in two days fix critical vulnerabilities
July 10, 2026
Updating Chrome is becoming an almost daily task lately. But it’s too important to ignore. On Wednesday, July 8, Google released another Chrome update, just one day later after the previous one. Between them, the two updates fixed 27 security vulnerabilities, including two critical flaws that could be exploited to compromise Chrome. Google says both are “use-after-free” memory vulnerabilities, which ...
- Microsoft has fixed the “RoguePlanet” zero-day in Microsoft Defender
July 9, 2026
Microsoft has quietly fixed the “RoguePlanet” zero-day in Microsoft Defender, closing the latest hole exposed by security researcher Nightmare Eclipse after months of public sparring over the company’s handling of vulnerability reports. The vulnerability, tracked as CVE-2026-50656, was addressed through an update to the Microsoft Malware Protection Engine rather than via its monthly Patch Tuesday bundle. Microsoft said ...
- WinRAR flaw could allow attackers to take control of your computer
July 2, 2026
Rarlab has released a new version of the popular WinRAR tool to patch a vulnerability that can be abused in remote code execution attacks. The issue is fixed in WinRAR 7.23, but users must install the new version manually because WinRAR still does not offer automatic updates. They also need to make sure they download the version that matches their ...
- Hackers breached DHS information-sharing network
June 30, 2026
A key Department of Homeland Security information-sharing database was accessed by an unknown threat actor in recent weeks, potentially exposing sensitive data exchanged between federal, state, local and industry partners, according to two people familiar with the matter. DHS investigators are probing the intrusion of the Homeland Security Information Network, said both people, who spoke on ...