Microsoft Subdomains Have A Massive Security Loophole, Leading To Cyber Attacks!

Microsoft subdomains are being sued for broadcasting spammy content, attacks and various other cyber attacks as pointed out by a researcher. What's more concerning that despite notifying the company multipole times, vulnerability is fixed only in 5% - 10% subdomains .

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A security researcher has pointed out the fact that Microsoft’s thousands of subdomains are prone to many vulnerabilities which can be taken advantage of. These subdomains can be hijacked and used for attacks against their own employees, users or for showing them spammy content according to him.

Michel Gaschet, the security researchers, is also a developer for brought this issue to light. Whilst in an interview with ZDNet, he mentioned that he has been reporting these subdomains to Microsoft for the past three years. However, either most of his reporting has been repeatedly been ignored or Microsoft has been fixing some of them silently. He believes that these subdomains have misconfigured DNS records.


Gaschet also privately shared a list of 117 subdomains, he reported to Microsoft last year, with ZDNet. The security researcher said he reported 21 subdomains that were vulnerable to hijacks to Microsoft in 2017 and then another 142 misconfigured subdomains in 2019.

Source: ZDnet

However, only 5-10% of all the subdomains he collectively reported were addressed and fixed by Microsoft whereas the others still remain misconfigured. It was noticed by him that subdomains such as and account.dpedge.microsft are more prioritised over the others as they are big. Hence, the other subdomains remain exposed to hijacking vulnerabilities.

These subdomains which are vulnerable to potential hijacks are because of basic misconfigurations in their respective DNS entries. A 2014 blog post from Detecify in 2014 explained the same in-depth.

“The root cause/mistake is a forgotten DNS entry pointing to something that doesn’t exist anymore, or never existed, like a typo in the DNS entry content,” Gaschet told ZDNet.

These misconfigured subdomains stayed the same because Microsoft never had to deal with any problems even though they were very much a sweet spot for attacking. In a hypothetical situation, an overly malicious attacker could have possibly taken over one of these subdomains whilst prompting Microsoft users to log in through a phishing page and collect their login credentials. Luckily enough Microsoft, no such malicious and dangerous attacker or group noticed this loophole but on the other hand, there are some who figured it out.

Source: ZDNet

It was reportedly pointed out on Twitter by Gaschet that one spam group figured out that they could hijack Microsoft’s subdomains and therefore, boost their spammy content by hosting it on a reputable domain.


Several ads for Indonesian poker casinos on at least four legitimate Microsoft subdomains were spotted which included,,, and Gaschet says these spammy advertisements are still very much active.

Microsoft has been reached out to for a comment regarding the same but we are still to be heard back from.

Microsoft’s Take On These Security Loopholes

One of the possible reasons as guessed by Gaschet that Microsoft is still not prioritizing these subdomain fixes could be because of the fact that the company’s bug bounty program doesn’t yet include these ‘subdomain’ takeovers’.

Therefore, the reporting of such issues get lined up way down in their priority list despite these issues being very severe. Microsoft, the multinational tech behemoth has been asked to revamp how it manages its DNS records, wherein lies the source of most of these misconfigurations by Gaschet.

It’s high time that Microsoft takes notice of this problem as it is easier to get rid of it while alarms are still going off and not after the situation has worsened.


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