Someone posted on Reddit not long ago about their company's MFP scanners — six locations, all sharing a single generic Gmail account for scan-to-email. The thread blew up, not because it was unusual, but because everyone recognized it immediately. They'd done the same thing. Or their clients had. Or they'd inherited it from whoever set up the office five years ago.
That shared Gmail account is sitting on your network right now, and there's a very good chance nobody is watching it.
Why This Feels Like a Small Problem (But Isn't)
Shared credentials on office devices feel like an IT housekeeping issue — the kind of thing you'll clean up someday when there's time. The printer works. Scans go through. Nobody's complained. Move on.
But according to The Hacker News, the FortiBleed operation harvested over 110 million credentials from more than 430,000 network devices — firewalls, VPNs, and infrastructure appliances that organizations configured once and largely forgot about. The attackers didn't need zero-days or sophisticated exploits. They needed devices that were set up, left alone, and never revisited.
Your office printer with a shared Gmail account fits that profile exactly.
And as SANS ISC noted in their analysis of CVE-2024-40766: the patch fixed the bug, but nobody fixed the configuration. That's the behavioral pattern that makes shared device credentials so dangerous. You configure the device, it works, and the underlying credential risk never gets addressed — because the device is working.
What's Actually at Risk
Let's be specific about what a shared scan-to-email account exposes you to:
No audit trail. When ten people across your office use the same account to scan documents, you have no idea who scanned what, when, or where it went. If a sensitive HR document gets scanned and forwarded to the wrong place, you cannot investigate it. For government contractors pursuing CMMC Level 1, this is a direct problem — individual accountability for system access is a baseline requirement.
No MFA. Generic Gmail or Outlook accounts set up for device use almost never have multi-factor authentication configured, because MFA would break the automated login the device needs. That means the account is protected by a password alone — often a weak, shared one that's been typed into a touchscreen by a dozen people over the years.
Credential stuffing exposure. That password has likely been reused somewhere. It's been typed on shared devices, written on sticky notes, included in onboarding emails. If the same credentials appear in a breach dump — and breach dumps are enormous right now — an attacker can walk right into that account. As Security News reported in a recent account takeover case, credential-based attacks succeed not because of exotic techniques but because of structural gaps in how authentication is managed. A shared account with no MFA and no monitoring is a structural gap.
Inbox access means document access. Whatever gets scanned and emailed flows through that inbox. Contracts. HR documents. Financial records. Patient intake forms. If an attacker compromises the account, they're not just in an email account — they're looking at a rolling archive of everything your office has scanned.
The "Set It and Forget It" Problem
This is worth naming directly: MFP scanners are infrastructure. IT admins configure them during setup, verify they work, and move on. Nobody puts a recurring calendar reminder to audit the scan-to-email credentials every quarter. Nobody checks whether the account password was rotated after an employee left. Nobody reviews the inbox for anomalous forwarding rules.
We've covered this pattern in the context of employee offboarding security and access revocation — departing employees often retain access to shared accounts long after they've left, because shared accounts don't get caught in standard offboarding checklists. A shared printer email account is exactly the kind of access that falls through the cracks.
It's also worth reading alongside our post on accidental credential exposure through third-party integrations, because scan-to-email setups often involve cloud relay services, vendor portals, or IT-managed SMTP credentials that carry their own exposure surface.
What to Do About It
This is fixable. It's not a major project — it's a configuration audit that most IT admins can knock out in an afternoon.
1. Inventory every device using a shared email account. Pull your list of printers, scanners, MFPs, fax-over-IP systems, and any other device configured to send email. Document what account each one uses.
2. Replace shared generic accounts with dedicated service accounts.
Create a dedicated, descriptively named account for each device or location (e.g., scanner-hq@yourdomain.com). This gives you an audit trail and limits blast radius if one account is compromised.
3. Use app passwords or SMTP relay with authentication. Most modern email platforms (Microsoft 365, Google Workspace) support app-specific passwords or dedicated SMTP relay configurations that don't require MFA exemptions on a primary account. Configure this properly so you're not punching a hole in your MFA policy.
4. Enable logging and alerts on those accounts. Set up login alerts, anomalous forwarding rule detection, and inbox monitoring. If someone logs into your scanner's email account from Romania at 3 AM, you want to know.
5. Rotate credentials and document them in a password manager. Change the passwords on all device email accounts, store them in your organization's password manager, and set a calendar reminder to rotate them annually at minimum. We've covered password manager options for small businesses if you need a starting point.
6. Check for inbox rules you didn't create. Log into each account and look for forwarding rules, filters, or auto-reply configurations. Attackers who gain access to email accounts routinely set up silent forwarding rules to maintain persistent access.
CMMC Contractors: This Is Specifically Your Problem
If you're pursuing CMMC Level 1 compliance, shared credentials on any system that touches Controlled Unclassified Information (CUI) — including documents that get scanned — is a compliance gap, not just a best-practice gap. Individual user identification and authentication is a Level 1 requirement. A shared account used by everyone in the office doesn't satisfy it.
Audit your devices before your assessor does.
Take Action
Shared printer credentials are the kind of blind spot that feels low-priority right until something goes wrong. The FortiBleed operation proved that attackers are actively harvesting credentials from devices organizations treat as infrastructure — and your office scanner fits that category.
Oscar Six Security's Radar ($99/scan) scans your external attack surface to identify exposed credentials, misconfigured services, and forgotten devices that show up as easy targets. It's the kind of proactive check that catches these issues before an attacker does.
Focus Forward. We've Got Your Six.