Link Hijacking

How Link Hijacking Works

Link hijacking turns a trusted link into a trust-break event. The user still clicks something that looks legitimate, but control of the destination has been altered through a redirect, a shortened URL, a compromised account, or a tampered link target.

The abuse is dangerous because many people treat links as a lightweight verification step. If the visible source or short form is trusted, the real destination can be overlooked, which gives attackers a simple way to move victims away from the intended site without changing the surrounding conversation or workflow.

Why Link Hijacking Is Effective

It succeeds by exploiting the gap between what a user sees and what the browser ultimately follows. A link may pass through multiple hops, be embedded in a platform that rewrites URLs, or be managed by an account that another party can take over. Any of those trust points can become the attack surface.

That makes link hijacking especially effective in phishing and business-email-compromise style scenarios, where the attacker wants the victim to keep the interaction moving. The user does not need to be convinced to install anything or reveal credentials immediately, only to trust the redirected destination long enough for the next step to happen.

Common Hijack Paths

There are a few recurring patterns. A short-link service or redirector can be abused if the target is changed. A shared link can be modified by someone who has access to the account, document, or platform object that controls it. Mobile and app flows can also be affected when deep links, universal links, or custom URL schemes are handled insecurely; NHIMG's Mobile Deep Link and App Link Security Guide covers those redirect and handler validation problems in more depth.

In practice, the technical issue is not just “a bad URL.” It is the loss of integrity in a routing mechanism that users implicitly trust. Once that routing layer is manipulated, the attacker can send traffic to a fake login page, a malware dropper, an attacker-controlled payment page, or any other destination that fits the campaign.

How Organisations Reduce Exposure

Exposure checks should start with inventory: where do short links, redirect chains, branded links, QR destinations, and app-link handlers exist, and who can change them? That matters because link hijacking is often a governance problem as much as a web security problem.

Teams should also review whether the link is publicly exposed, embedded in email, SMS, chat, social content, mobile apps, or documentation, because the blast radius changes with distribution. For mobile and app-based destinations, verified handlers and strict redirect handling are central, and NHIMG's Mobile App Security Guide provides the adjacent controls that often determine whether a hijack path exists at all.

Detection, Response, and Recovery

Detection is usually about noticing destination drift, unusual redirect behaviour, or link-target changes that were not authorised. Logging should capture who changed the target, when it changed, and whether any campaigns or distributions still point to the old location. If a hijack is discovered after users have clicked, treat the destination as potentially hostile until the chain is fully understood.

Response should include pulling or replacing affected links, warning users who may have clicked them, and reviewing whether the redirected destination captured credentials, sessions, or tokens. Where the hijack leveraged redirector logic or platform control, confirm that the underlying account or service is secured before the link is restored, so the same path cannot be reused.

Risk and Threat Considerations

Link hijacking is risky because it lets an attacker reuse a trusted communication channel for a fraudulent destination. The user interaction still looks normal, which lowers suspicion and can bypass the initial trust a recipient places in a known sender or branded short link.

Failure mechanism: Control of the link target, redirect chain, or link-managing account is lost or manipulated, so the visible link no longer resolves to the intended destination.

Impact: Victims can be steered to phishing pages, session-stealing flows, malware delivery, or unwanted traffic redirection, and defenders may miss the change until after clicks have already occurred.

Practitioner Guidance

What to watch for: Treat link integrity as a change-controlled asset, not a disposable convenience. If your organisation uses link shorteners, redirectors, or app-link infrastructure, the owner, target, and expiry rules should be explicit, because the same mechanism that simplifies sharing can also concentrate abuse potential.

Common misunderstanding: A short link is not inherently safer because it is branded or familiar. The real security question is whether the destination can be changed, by whom, and whether users have any reliable way to verify that the target still matches intent.

Related resources from NHI Mgmt Group

• How can security teams reduce the risk of session hijacking in SaaS environments?
• Why does MFA not stop session hijacking?
• What is the difference between credential theft and session hijacking?
• What is the difference between public link control and standard access review?