HomeChatGPT Spreadsheet Plugin Reveals Critical Financial Data Security Flaw
As AI tools become standard in offices, many professionals rely on smart plugins to manage complex spreadsheet data. Yet, a recent alert from security firm PromptArmor highlights a critical risk for the industry. The investigation uncovered severe cybersecurity flaws in a popular browser extension known as "ChatGPT for Google Sheets."
Malicious Instructions Harvest Data Across Accounts
This vulnerability stems from an "Indirect Prompt Injection" attack. By importing external datasets that appear harmless but contain hidden commands, attackers can trigger the AI plugin without permission. Hackers then bypass standard security measures, execute external scripts to infiltrate financial models, and automatically locate other workbooks linked to the account. This process systematically extracts sensitive assets, including budget templates and contract ledgers.
Fake Official Pop-ups Steal Credentials
The attack chain extends further into a phishing overlay strategy. Malicious scripts can manipulate the plugin’s interface to mimic official extensions, displaying fake authentication windows or permission requests. Because these pop-ups appear legitimate, users may unknowingly enter their login details, resulting in total account compromise. Security experts currently recommend that users audit their installed AI extensions and immediately revoke unnecessary spreadsheet access permissions.
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As AI tools become standard in offices, many professionals rely on smart plugins to manage complex spreadsheet data. Yet, a recent alert from security firm PromptArmor highlights a critical risk for the industry. The investigation uncovered severe cybersecurity flaws in a popular browser extension known as "ChatGPT for Google Sheets."
Malicious Instructions Harvest Data Across Accounts
This vulnerability stems from an "Indirect Prompt Injection" attack. By importing external datasets that appear harmless but contain hidden commands, attackers can trigger the AI plugin without permission. Hackers then bypass standard security measures, execute external scripts to infiltrate financial models, and automatically locate other workbooks linked to the account. This process systematically extracts sensitive assets, including budget templates and contract ledgers.
Fake Official Pop-ups Steal Credentials
The attack chain extends further into a phishing overlay strategy. Malicious scripts can manipulate the plugin’s interface to mimic official extensions, displaying fake authentication windows or permission requests. Because these pop-ups appear legitimate, users may unknowingly enter their login details, resulting in total account compromise. Security experts currently recommend that users audit their installed AI extensions and immediately revoke unnecessary spreadsheet access permissions.
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