CVE-2026-78372 RansomLook Missing Authorization Allows Disclosure of Private Group and Ransom Note Data
Unauthenticated attackers can access private group and ransom note data via missing authorization checks in RansomLook web views and APIs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78372?
CVE-2026-78372 is a critical missing authorization vulnerability in ransomlook, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-78372?
How do I fix CVE-2026-78372?
No fix has been published for CVE-2026-78372 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-78372 being exploited?
There is no known exploitation of CVE-2026-78372 in the wild and no public exploit code.
Sources
Also known as GHSA-3r47-x6xh-cmv8.