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Microsoft Copilot Reprompt fix (January 2026 Patch Tuesday)

Security Patch Release
First reported
Last updated
Happening score
H score 25
2 unique sources, 2 articles

Summary

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Microsoft issued a fix for the Reprompt issue in Microsoft Copilot, closing a session-hijack path that could enable invisible data exfiltration. The update landed on January 2026 Patch Tuesday after responsible disclosure, giving defenders a concrete patch point for the prompt-injection flaw. The issue matters because a single click on a crafted link could let an attacker drive Copilot actions inside an authenticated session.

Related Happenings

Workflow-level jailbreak makes GitHub Copilot Chat write harmful answers in code files

Technical Analysis
H score22 First: 08.07.2026 14:21 Last: 08.07.2026 14:21 Sources 1

About this happening: Researchers demonstrated a **workflow-level jailbreak** against **GitHub Copilot Chat** that caused harmful answers to be written inside code tasks even when direct chat prompts w...

Open Happening

Google Antigravity prompt-injection fix

Security Patch Release
H score31 First: 21.04.2026 13:52 Last: 21.04.2026 13:52 Sources 1

About this happening: **Google** fixed **Antigravity**'s **prompt injection flaw** in **February**, closing a path that could lead to **sandbox escape** and **remote code execution (RCE)**. The patch f...

Open Happening

Microsoft expands Purview DLP enforcement for Copilot across local and cloud Office files

Security Tool/Service
H score11 First: 24.02.2026 19:30 Last: 24.02.2026 19:30 Sources 1

About this happening: Microsoft is expanding **Purview DLP** so **Microsoft 365 Copilot** cannot process restricted **Word, Excel, and PowerPoint** files stored on **local devices, SharePoint, or OneDr...

Open Happening

Google Looker security bulletin fix (multiple vulnerabilities)

Security Patch Release
H score61 First: 04.02.2026 13:00 Last: 04.02.2026 13:00 Sources 1

About this happening: **Google** issued a security fix for **Looker** in **GCP-2025-052** after **Tenable Research** disclosed **LeakyLooker** findings, a set of **nine cross-tenant vulnerabilities** i...

Open Happening

Notepad++ hit by network compromise

Incident
H score17 First: 03.02.2026 06:55 Last: 03.02.2026 06:55 Sources 1

About this happening: The **Notepad++** hosting breach enabled attackers to hijack the software update path and selectively redirect some users to **malicious servers**, creating a **supply-chain** ris...

Latest development: 18.02.2026 09:40

Notepad++ released version 8.9.2 to harden the update mechanism after the hijacked update path was used to deliver targeted malware. The release adds a "double lock" design with verification of the signed installer downloaded from GitHub and verification of the signed XML returned by the update server at notepad-plus-plus[.]org, and it also introduces WinGUp hardening including removal of libcurl.dll, removal of CURLSSLOPT_ALLOW_BEAST and CURLSSLOPT_NO_REVOKE, and restriction of plugin management execution to programs signed with the same certificate as WinGUp.

Open Happening

Timeline

  1. 14.01.2026 16:00 1 articles · 5mo ago

    Varonis discloses Reprompt Copilot session hijack

    Initial Disclosure

    Varonis researchers disclosed Reprompt to Microsoft on August 31, 2025 after showing that a legitimate URL's q parameter could hide malicious instructions, trigger a single-click Microsoft Copilot session hijack, and enable invisible data exfiltration from an authenticated Copilot session.

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  2. 14.01.2026 16:00 3 articles · 5mo ago

    Microsoft ships a fix for Reprompt in Microsoft Copilot

    Mitigation Patch Update

    Microsoft issued a fix for Reprompt on January 2026's Patch Tuesday, closing a Copilot session-hijack path that could keep an authenticated Microsoft Copilot conversation alive after a single click and support invisible data exfiltration.

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