Suspicious Login Issues

Fix: DocuSign Link Redirects to an Unexpected Excel Login Page

Kushani Nimanthika Oct 16, 2026 868 views

Question details

The user clicked a document review link claiming to be from DocuSign but was redirected to a suspicious Microsoft Excel login screen hosted on Firebase.

DocuSign Link Redirects to an Unexpected Excel Login Page

Product: Microsoft Excel
Device & OS: not provided
Scenario: Attempting to access and review a digital document via a link received in an email.
Observed behavior: Instead of opening a standard DocuSign portal, the link routes the user through Firebase and displays an unexpected login page mimicking Microsoft Excel to harvest credentials.

Before you start

Do not enter any email addresses, passwords, or personal information on the redirected page, and close the browser tab immediately to prevent potential credential theft.

Solution 1Recommended

Verify the Link Source and Contact the Sender

Validate the authenticity of the email and safely request a legitimate document link to avoid falling victim to a phishing scam.

Phishing campaigns often use familiar brands like DocuSign and Microsoft Excel to steal login credentials. Hosting a fake login page on Firebase is a common tactic used by malicious actors to bypass standard corporate security and spam filters.

Inspect the sender's email address

Check the sender's email address closely for slight misspellings or unusual domains (e.g., '@docusign-support-team.com' instead of the official '@docusign.com').

Hover before you click

Hover your mouse cursor over the original link in the email without clicking it to inspect the actual destination URL shown at the bottom of your browser or email client.

Contact the sender directly

Reach out to the supposed sender using a known, trusted phone number or by starting a completely new email thread. Do not reply to the suspicious email.

Request a secure document

Ask the sender to manually send the document as an attachment or provide a secure, standard review link.

Verify the Link Source and Contact the Sender

Security Alert: Legitimate DocuSign links operate independently and will never redirect you to a Microsoft Excel or Firebase login page to view a document.

Solution 2

Report the Phishing Attempt and Secure Your Account

Take immediate action to secure your system and credentials if you suspect the email is malicious or if you accidentally interacted with the fake login page.

Free Microsoft Office alternative

Securely Open, Edit, and Sign Documents with WPS Office

Avoid the risks of sketchy online login portals and phishing links. WPS Office provides a secure, lightweight, and offline environment to view, edit, and sign your documents natively without unnecessary cloud login prompts.

1. Download WPS Office: Visit the official WPS website to download and install the free, secure desktop application.
2. Open files safely: Launch WPS Office and click 'Open' on the homepage to safely view and edit local Excel or PDF files.
3. Sign documents offline: Use the 'PDF Edit' tab to securely add your digital signature to documents without using external web links.

Open and edit Microsoft Word, Excel, and PDF formats securely in a local, offline environment.Highly compatible with Microsoft Office formats (XLSX, DOCX, PPTX) to prevent formatting loss.Built-in robust PDF toolkit for safe digital signatures without relying on third-party web links.Lightweight, fast-loading application that prioritizes your data privacy and security.

microsoft office alternative - wps office

Frequently Asked Questions

Why do hackers use Firebase for fake Excel login pages?

Firebase is a legitimate, Google-backed cloud hosting platform. Because it is highly trusted by web browsers and security software, URLs hosted there often bypass standard email spam filters. Hackers exploit this inherent trust to host fake login portals that mimic Microsoft Excel without getting immediately blocked.

What happens if I entered my password on the fake Excel login page?

If you typed your credentials into the fraudulent page, your username and password have likely been sent directly to the attackers. You must immediately change your Microsoft account password via the official Microsoft website and log out of all active sessions to secure your account.

Will a real DocuSign link ever ask for Microsoft Excel credentials?

No. DocuSign is a completely separate service from Microsoft. A legitimate DocuSign review link will never require you to log into Microsoft Excel, Office 365, or Firebase to view or sign a document. It will only direct you to DocuSign's secure, proprietary environment.

Microsoft Office Security Issues