Medium [CVE-2026-82437] Apache Storm: Description The Logviewer offers `logs.users` and `logs.groups` so operators can control who may read log content
This medium-severity Apache Software Foundation advisory covers CVE-2026-82437; related products: Apache Storm.
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Summary
The Logviewer offers `logs.users` and `logs.groups` so operators can control who may read log content. For
daemon logs those settings were not applied: the access decision combined the "this is a daemon log" flag with the authorizer result in a way that discarded the authorizer's answer whenever the flag was set,
the daemon log page and download endpoints reached the handler without consulting an authorizer at all. Any
user able to pass the configured servlet filter could therefore read `nimbus.log`, `supervisor.log` and the other daemon logs on every reachable node, which contain other tenants' topology names, owners
configuration fragments.
The same advisory covers the log listing endpoints, which accepted a user argument and never applied it, so `/listLogs` and `/searchLogs` returned every tenant's topology and worker log file names regardless of the
caller. That part is metadata only.
There was no configuration that closed either behaviour.
Affected product named by the advisory: Apache Storm.
- Apache Storm Logviewer 3.0.0 before 3.1.0
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Mitigation Upgrade to 3.1.0, where the daemon log paths evaluate the same configured user and group lists that the worker log paths already used, and the listing endpoints filter by the requesting user.
- Users who cannot upgrade immediately should place the Logviewer behind a reverse proxy that restricts the daemon log endpoints, and should treat daemon log content as readable by any filter-authenticated user.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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