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AI prompt injection technique now used by spammers to evade email filters

By PulseAugur Editorial · [2 sources] ·

A technique known as ASCII smuggling, initially developed to make AI prompt injection attacks more covert, is now being exploited by spammers to bypass email filters. This method uses invisible Unicode characters that are readable by computers but undetectable to humans. Microsoft Defender for Office 365 observed a dramatic surge in spam messages employing ASCII smuggling, with daily detections escalating from thousands to millions, indicating a significant shift in how malicious actors are attempting to deliver unwanted content. AI

IMPACT Spam campaigns are evolving to bypass AI-powered defenses, necessitating new detection strategies.

RANK_REASON A security technique developed for AI attacks is being repurposed for spam, with a significant increase in detection rates.

Read on Mastodon — mastodon.social →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

AI prompt injection technique now used by spammers to evade email filters

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28 / 100
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Tool
A security technique developed for AI attacks is being repurposed for spam, with a significant increase in detection rates.
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2 independent sources
Multiple independent publishers reporting the same story raises confidence that it's real and newsworthy.
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other
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High
Clearly on-topic for AI-industry coverage.
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Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [2]

  1. Ars Technica — AI TIER_1 English(EN) · Dan Goodin ·

    Once popular for attacking AI, ASCII smuggling is embraced by spammers

    A once-overlooked block of unicode that's invisible to humans is gaining ever wider use.

  2. Mastodon — mastodon.social TIER_1 English(EN) · [email protected] ·

    📰 Once popular for attacking AI, ASCII smuggling is embraced by spammers A once-overlooked block of unicode that's invisible to humans is gaining ever wider use

    📰 Once popular for attacking AI, ASCII smuggling is embraced by spammers A once-overlooked block of unicode that's invisible to humans is gaining ever wider use. 📰 Source: Ars Technica 🔗 Link: https://arstechnica.com/security/2026/09/once-popular-for-attacking-ai-ascii-smuggling-…

    LINKS arstechnica.com/…/once-popular-for-attack…

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