A LinkedIn Smart Link can be legitimate and still be used to route someone to a phishing page. In a report published January 31, 2024, Microsoft described a campaign that abused Smart Links to lead people to fake Microsoft sign-in forms, sometimes prefilled with the target’s email address. The report documents a historical technique; it does not establish that the same campaign is active today.
How the LinkedIn Smart Link phishing worked
LinkedIn Smart Links are a legitimate feature associated with business accounts and Sales Navigator. They let users distribute content and track engagement. Microsoft Defender for Office 365 Security Research reported that attackers abused the feature as a route to credential-harvesting pages.
A typical Smart Link uses a LinkedIn domain and a code parameter. In the campaign Microsoft observed, links instead included obfuscated target email addresses where the expected code would normally appear. Clicking could send a person directly to a phishing site or take them there through redirects. The phishing kit extracted the email address from the link and used it to autofill a fake Microsoft sign-in form.
That personalization could make the credential request feel more expected, but a prefilled address is not proof that a page is genuine. Microsoft’s Sehrish Khan wrote: “It is important to note that slinks are not inherently malicious.” (Microsoft Community Hub, January 31, 2024.)
Is this LinkedIn Smart Link safe?
The visible host and the final destination are separate parts of a link’s journey. A familiar LinkedIn address may be an intermediate step before a redirect to another website, so seeing LinkedIn in the URL does not establish that the eventual page is safe. At the same time, a Smart Link is not dangerous simply because it is a Smart Link.
- Was the message or link expected, and do you recognize the sender?
- Does the link’s eventual destination make sense for the content you were promised?
- Did it unexpectedly ask you to sign in, especially with a prefilled address?
- Can you reach the service through a route you independently trust, rather than through the message?
These are practical questions, not a complete technical test or a guarantee of safety. If a link unexpectedly opens a sign-in page, do not enter your password just because the page looks familiar or already contains your email. Instead, open the service using a saved bookmark or its known address, or contact the sender through a separate trusted channel.
Why did a LinkedIn link open a Microsoft sign-in page?
In the campaign Microsoft described, the link led to a fake Microsoft sign-in form designed to collect credentials. The victim’s email could be encoded obliquely in the Smart Link and then inserted into the form by the phishing kit. That could make the page appear tailored to the person who clicked, but it did not make the page an authentic Microsoft sign-in screen.
The January 2024 report establishes the method Microsoft observed at that time. It does not establish current campaign activity, who was responsible, how many people were affected, or how prevalent the technique was. Treat it as a documented example of link abuse, not as evidence of a current alert or a claim that every LinkedIn-to-Microsoft sign-in flow is fraudulent.
How to report a suspected LinkedIn phishing attempt
LinkedIn provides reporting controls for suspicious content. For a phishing email that appears to come from LinkedIn, its help page says to forward it to phishing@linkedin.com. For a suspicious message or comment on LinkedIn, use the in-product reporting options. (LinkedIn Help: Phishing content.)
- For a LinkedIn message: Open the message’s More menu, select Report/Block, choose It’s spam or a scam, and complete the prompts.
- For a phishing comment: Open the comment’s More menu, select Report Post, choose Fraud or scam, and follow the prompts.
- For a suspected LinkedIn phishing email: Forward it to phishing@linkedin.com.
Microsoft 365 administrator response checklist
Microsoft’s anti-phishing guidance describes general Microsoft 365 response and prevention measures. These controls are useful for investigating phishing and reducing organizational exposure, but the guidance does not say they specifically prevent the LinkedIn Smart Link technique.
- Contain account compromise and the phishing message. Investigate any potentially compromised accounts and block further phishing activity. Use available Defender for Office 365 tools to identify other recipients and assess the scope of the incident.
- Review how the message was delivered. Inspect message headers to understand its delivery path and filtering. Use Microsoft’s phishing-reporting options, including Outlook’s built-in reporting control, where appropriate.
- Verify relevant protections. Check that Safe Links, Safe Attachments, and anti-phishing policies are configured as intended. Review impersonation protection: Microsoft notes it is not enabled in the default anti-phishing policy and requires configuration.
- Review identity and mail-flow exposure. Consider MFA for users and review external forwarding rules that could be used to extract data.
- Monitor protection results. Periodically review threat-protection reporting to spot patterns and assess whether configured controls are working as intended.
See Microsoft Learn’s anti-phishing protection guidance for configuration details and policy options.
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