📊 Amendment 13 - Accounting Sector
Accounting Firms and Amendment 13: You Hold the Financial Secrets of Dozens of Businesses
Financial statements, tax reports, cash flows, payroll data - belonging to multiple clients. A breach into one accounting firm opens access to the complete financial picture of dozens of businesses. Amendment 13 makes this your responsibility.
📅 March 2026
⏱ ~7 minutes read
✍️ VARNOXX
Why Accounting Firms Are High-Value Targets
Security Level
Intermediate
Data at Risk
From Dozens of Clients
Liability
Including Third-Party Breaches
The Critical Point: One accounting firm is a risk multiplier. A single breach exposes financial information from dozens of businesses simultaneously. While a single company faces immediate damage, an accounting firm compromises an entire chain of clients.
What's at Risk?
- Clients' income and loss statements
- VAT and income tax reports
- Payroll and employee data
- Invoices and cash flow reports
- Information about debts and loans
- Bank balances and receipts from authorities
Accountants share data with tax authorities, banks, external auditors, and insurers - each link in the chain is a point of vulnerability. Amendment 13 makes you responsible for every one.
The Double Risk: Yours and Your Clients'
⚠️ Legal Requirement: Amendment 13 explicitly states - if you shared information with a third-party vendor and a breach occurred there, you remain liable. This means if your accounting software, call center, or scanning service was compromised - fines can reach you, not the vendor.
This requires a Data Processing Agreement (DPA) with every tool or vendor that has access to client data. It's not just legal documentation - it's your proof that the vendor is aware of regulations and committed to security.
Examples of Tools and Software Requiring a DPA
- Priority - accounting management system
- Hashavshevet - transaction recording and reports
- SAP / Oracle - large ERP systems
- Zoom / Microsoft Teams - client calls and discussions
- Google Workspace / Microsoft 365 - folder storage
- Scanning / OCR service - scanning financial documents
- Email - Exchange, Gmail, or private mail servers
If you don't have signed DPAs in place, you're in legal jeopardy beyond just security concerns.
What Amendment 13 Requires From Your Firm
Accounting firms are classified as holders of "sensitive data" under Amendment 13, and are subject to a specific set of mandatory requirements. Here is the complete obligations checklist:
✓ Requirements Checklist for Accounting Firms
This isn't a suggestion - it's a clear list Amendment 13 requires from accounting firms.
The Risk Most Firms Overlook
Email is the primary attack vector. Not file encryption - email.
Real-World Scenario: An attacker identifies that you are the accountant for a specific small business. They breach your email account and send your client payment instructions in your name - to their own bank account. The client transfers the funds without suspicion - after all, it came from their accountant's email address. This is BEC - Business Email Compromise - and the damage is both financial and to the trust you've built with your client.
Additional risks most firms ignore:
⚠️ Common Vulnerabilities
- Old Excel files with unencrypted data - sent via regular email to clients or auditors
- Shared network drives without access controls - every employee sees all client folders
- Remote access tools (VPN, RDP) without two-factor authentication - open door for attackers
- Shared passwords among multiple accountants - no audit trail of who accessed what client
- Weak offboarding - terminated employees still have access to systems
Assess Your Firm's Exposure Level
VARNOXX works with accounting firms in central Israel. An initial exposure assessment includes a complete map of security vulnerabilities, review of client file access controls, and a compliance readiness report.
✓ Client file access audit
✓ Email security and DPA review
✓ Amendment 13 compliance report
✓ Actionable implementation roadmap
Free Initial Exposure Assessment
Schedule Your Assessment →
📧 info@varnoxx.com
📞 +972-58-634-0063
See also - guides for other industries: