Slack’s AI, which provides tools to summarize conversations and search for information, is susceptible to “fast injection” attacks. This vulnerability allows attackers to access data from private channels by crafting custom queries that trick the AI into leaking information. PromptArmor showed that attackers could inject malicious requests into public channels, which the AI could then use to obtain sensitive data like API keys.
This flaw was exacerbated by a recent Slack update that included files from channels and direct messages in AI responses. This addition increases the risk, as attackers could use the feature to extract sensitive documents. PromptArmor recommended that Slack workspace administrators limit AI access to documents until a fix is found.
Source: Ferra

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