Executive brief
RansomLook is a threat intelligence platform that monitors ransomware groups and marketplaces. A flaw in its privacy controls causes victim information from privately-configured groups and markets to leak through public notification channels (Rocket.Chat, Mastodon, Bluesky, email) and a public MISP feed, potentially exposing sensitive victim names and incident details that were intended to remain confidential.
Technical details
RansomLook fails to enforce privacy status when distributing newly collected victim posts to external notification channels and feeds. The vulnerability stems from incomplete privacy checks: the post-processing logic verifies individual posts are marked private, but neglects to validate the privacy status of the parent group or market. Additionally, the public MISP feed determination relied on groupinfo() which only checked the group database and did not evaluate market-level privacy flags. An attacker with access to public notification channels or the MISP feed can retrieve victim information configured as private. The fix introduces a centralized is_private_entity() check covering both groups and markets, preventing distribution of private entity posts through external channels while preserving internal storage and alerting.
Affected products
- RansomLook
Timeline
- 2026-08-24: disclosed