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criticalOSINT Alert

ASCII smuggling crosses over from AI prompt injection to phishing evasion

Invisible Unicode characters popularized for hiding instructions from AI models are now being used to obfuscate words before email filters parse them. The post ASCII smuggling crosses over from AI prompt injection to phishing evasion appeared first on Microsoft Security Blog. ]]>

Thursday, September 3, 2026MicrosoftVulnios Threat Intelligence
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Vulnerability Snapshot

This advisory is rated CRITICAL โ€” exploitation is trivial or already observed in the wild and impact is severe. Patch immediately, not on the next maintenance window.

Affected technology: edge.

Executive Summary

Invisible Unicode characters popularized for hiding instructions from AI models are now being used to obfuscate words before email filters parse them. The post ASCII smuggling crosses over from AI prompt injection to phishing evasion appeared first on Microsoft Security Blog. ]]>

Source

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Affected Products

edge

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Frequently Asked Questions

What is "ASCII smuggling crosses over from AI prompt injection to phishing evasion"?

This is a critical-severity osint alert from Microsoft Threat Intelligence. It covers edge and was flagged for security teams to evaluate.

Am I affected?

Check whether your environment runs edge. If you operate any of those, treat yourself as in scope until you have evidence otherwise. A Vulnios scan will identify the exact assets carrying the affected version.

How urgent is the response?

Critical: do not wait for your normal patch cycle. Verify exposure today, apply the vendor patch immediately, and add detection rules for any post-exploit indicators.

How do I remediate?

Apply the vendor patch listed in the upstream advisory linked under Sources. If the patch is not yet available, follow the vendor-supplied workaround (often a config flag or feature disable) and add detections for the published exploit pattern in your SIEM. Re-scan after the patch lands to confirm the finding clears.

How does Vulnios help with this?

Vulnios continuously cross-references your asset inventory against the live CVE feed (NVD, vendor advisories, CISA KEV, and curated OSINT). When a new CVE matches your environment, you get a prioritized finding with the severity, KEV status, exploit-prediction (EPSS), and a direct path to the vendor patch. You can start a free scan from the homepage.

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