CVE-2026-78372: RansomLook Missing Authorization Allows Disclosure of Private Group and Ransom Note Data
RansomLook does not consistently enforce authorization checks when accessing groups, markets, and ransom notes marked as private. An unauthenticated or otherwise unauthorized remote attacker can access information associated with private entities through several web views and API endpoints.
The affected functionality can disclose private group or market names, ransom-note content, and metadata associated with private groups. The /compare functionality can also be queried directly with the name of a private entity, allowing an unauthorized user to retrieve information such as post counts, mirror totals, and uptime even when the entity is excluded from the normal user interface. The patch explicitly adds a privacy check before returning this information.
Ransom-note views, search results, and API endpoints were similarly missing consistent filtering. The fix introduces normalized private-group identifiers and alias handling, then rejects or filters notes associated with private groups before returning them to unauthorized callers.
An attacker can exploit the issue remotely without authentication or user interaction, resulting in disclosure of information that was explicitly intended to be restricted to authorized users.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Enforce authorization checks when accessing groups, markets, and ransom entity so unauthorized callers cannot retrieve private group/market names, ransom-note content, or related metadata. Filter/reject notes associated with private groups before returning search results, /compare, web views, and API endpoint responses.
RansomLook authorization checks for private groups/markets/ransom entity access = enforce
Event History
Frequently Asked Questions
Who can exploit this issue?
An unauthenticated or otherwise unauthorized remote attacker can exploit it. No user interaction is required.
Which application areas may expose private information?
The affected paths include group, market, and ransom-note web views; search results; API endpoints; and the /compare functionality. Direct /compare queries using a private entity name can return post counts, mirror totals, and uptime.
What information may be disclosed?
Unauthorized users may obtain private group or market names, ransom-note content, and metadata associated with private groups. Information intended to be hidden from the normal interface may still be retrievable through direct requests.
What does the available fix change?
The patch adds privacy checks before returning private-entity information. It also normalizes private-group identifiers and aliases, and rejects or filters notes associated with private groups for unauthorized callers.