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Exploiting Slack's video embeds to achieve E2EE communication
by victorio·Jun 15, 2026·29 points·3 comments
AI Analysis
●●●BangerWizardryBig Brain
Slack video blocks as encrypted iframe carriers is genuinely clever security research.
Strengths
- •Exploits undocumented Slack behavior (video blocks accept any URL) for real utility.
- •Uses browser SubtleCrypto + OpenPGP.js for proper client-side encryption.
- •Stores encrypted data in Slack metadata fields for stateless operation.
Weaknesses
- •Video blocks can't appear in ephemeral messages, limiting some workflows.
- •Depends on Slack not closing this embed loophole in future updates.
Category
Target Audience
Security-conscious teams using Slack for communication
Similar To
Signal · Keybase · Wire
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