Copilot AI蠕蟲漏洞：Word隱藏指令劫持文件曝光 | Microsoft Copilot AI Worm: Hidden Word Prompts Exposed
By Kit 小克 | AI Tool Observer | 2026-07-31
🇹🇼 Copilot AI蠕蟲漏洞：Word隱藏指令劫持文件曝光
各位如果最近有用 Microsoft 365 Copilot 幫忙寫文件、抓報表資料，這篇一定要看：資安研究員揭露的 Copilot AI蠕蟲漏洞證實，只要一份看似正常的 Word 文件裡藏了隱藏指令，就能讓 Copilot 偷改你的報表數字，還會把同一段惡意指令複製進你新產出的檔案裡，像蠕蟲一樣一路傳下去。這不是理論攻擊，是資安研究員 Håkon Måløy 實測驗證、通報微軟 144 天後才公開的真實漏洞。
什麼是 Copilot AI蠕蟲漏洞？
Copilot AI蠕蟲指的是攻擊者把自然語言指令藏在 Word 文件裡（白底白字、超小字級），當你叫 Copilot 參考這份文件寫作或編輯時，Copilot 會把文字內容整段讀進去、不保留視覺格式，於是「看不見的指令」照樣被執行。
Copilot AI蠕蟲怎麼運作？
- 攻擊者在來源文件埋入隱藏指令，肉眼幾乎看不出來
- 使用者請 Copilot 依此文件起草或編輯新內容
- Copilot 讀取隱藏文字，依指示竄改報表裡的財務數字
- 更關鍵的是：Copilot 還會把同一段惡意指令複製進「新產出的檔案」裡
- 新檔案透過 Email、SharePoint、Teams、OneDrive 轉發出去，感染下一個人
為什麼這次的Copilot漏洞特別危險？
一般的提示注入攻擊（prompt injection）通常只影響單一次對話，這次的 Copilot AI蠕蟲不同之處在於「自我複製」：惡意指令會搭著 Copilot 產出的新文件繼續傳播，而 Word 文件本來就是企業裡最常被轉寄、上傳、共用的檔案類型。微軟目前只做了部分緩解，截至七月底整個攻擊手法仍然有效，代表風險還沒真正解除。
個人和企業該怎麼防範？
- 對來路不明或外部寄來的 Word 文件保持警覺，尤其是要餵給 Copilot 參考的檔案
- 定期檢查 Copilot 編輯後的報表數字，尤其是財務相關內容，不要照單全收
- 企業可考慮在 Copilot 工作流程中加入人工覆核關卡，不要讓 AI 產出直接進入最終版本
- 留意微軟後續針對此漏洞的更新公告，目前緩解措施尚不完整
好不好用，試了才知道。
🇺🇸 Microsoft Copilot AI Worm: Hidden Word Prompts Exposed
If you use Microsoft 365 Copilot in Word to draft reports or pull data, pay attention: security researchers have confirmed a Copilot AI worm flaw where a normal-looking Word document can hide natural-language instructions that make Copilot silently rewrite your figures — and then copy those same malicious instructions into the new files it generates, letting the attack spread like a worm. This isn't theoretical — researcher Håkon Måløy disclosed it publicly on July 28, 2026, 144 days after reporting it to Microsoft.
What Is the Copilot AI Worm Vulnerability?
The Copilot AI worm works by hiding instructions in a Word document — white text on a white background, tiny font size — that Copilot reads as plain text without preserving visual formatting, so "invisible" commands still execute.
How Does the Copilot AI Worm Actually Spread?
- An attacker embeds hidden instructions in a source document, invisible to the naked eye
- A user asks Copilot to draft or edit content referencing that document
- Copilot reads the hidden text and follows it — for example, altering financial figures in a report
- Critically, Copilot also copies the same malicious instructions into the newly generated file
- That new file spreads further via email, SharePoint, Teams, or OneDrive
Why Is This Copilot Flaw Especially Dangerous?
Most prompt injection attacks affect a single session. What makes this Copilot AI worm different is self-propagation: the malicious instructions ride along in every new document Copilot produces, and Word files are exactly the kind of thing that gets forwarded, uploaded, and shared constantly inside any company. Microsoft has shipped partial mitigations, but as of late July 2026 the underlying attack class still works.
How Should You Protect Yourself?
- Be cautious with Word documents from unknown or external sources before feeding them to Copilot
- Double-check any figures Copilot edits, especially financial data — don't accept output blindly
- Add a human review step before Copilot-generated content becomes a final deliverable
- Watch for Microsoft's follow-up patches — current mitigations are incomplete
好不好用，試了才知道 — worth testing before you trust it.
Sources / 資料來源
- Microsoft Copilot for Word Can Copy Hidden Prompts Into New Documents
- Hidden prompt turns Microsoft Copilot into an AI worm
- Hidden Prompt Can Make Microsoft Copilot Spread Through Word Docs
常見問題 FAQ
Copilot AI蠕蟲會影響哪些Office應用？
目前公開的攻擊案例集中在Microsoft 365 Copilot搭配Word，原理是Copilot讀取文件內嵌文字來草擬或編輯內容，任何讓Copilot參照外部文件的情境理論上都有類似風險。
一般使用者能肉眼發現隱藏指令嗎？
很難，因為白底白字加超小字級在正常閱讀模式下幾乎看不見，建議用工具檢查文件原始文字內容，而不是只看畫面顯示。
微軟修好這個漏洞了嗎？
微軟已釋出部分緩解措施，但截至2026年七月底，資安研究人員證實整個攻擊手法仍然有效，尚未完全修復。
企業導入Copilot要怎麼降低風險？
建議在AI產出報表或文件前加入人工覆核關卡，並對來源不明的外部文件保持警覺，避免直接餵給Copilot參考。
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