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6.5

CVE-2026-82433: Apache Storm Nimbus and UI expose passwords via config API

CVE-2026-82433 · published 1 month ago
Summary

The Storm management interface can return the full cluster configuration, including secret passwords for TLS and ZooKeeper, to any user who can reach the UI endpoint. This happens because the endpoint does not check the user’s rights before sending the data. Upgrade to version 3.1.0 or place a login‑required proxy in front of the UI and change the exposed passwords as a temporary fix.

What to do
  • Update apache software foundation apache storm nimbus to version 3.1.0 or later.
  • Update apache software foundation apache storm ui to version 3.1.0 or later.
Affected software
VendorProductAffected versions
apache software foundation apache storm nimbus < 3.1.0
apache software foundation apache storm ui < 3.1.0
Original advisory text
Description `getNimbusConf` returned the complete daemon configuration without redaction after only a user-level authorization check. Where the cluster is configured with them, that response inclu...
Description

`getNimbusConf` returned the complete daemon configuration without redaction after only a user-level
authorization check. Where the cluster is configured with them, that response includes
`storm.zookeeper.auth.payload` and the keystore and truststore passwords for the Thrift, Netty and
ZooKeeper TLS configuration. The project masks passwords elsewhere before display, so the omission here is
inconsistent rather than intended.

The UI endpoint `/api/v1/cluster/configuration` compounded this. It carried no `@AuthNimbusOp` annotation,
and the authorization filter treated a missing annotation as "no gate required" and returned immediately, so
the endpoint applied no per-user check at all and proxied the request under the UI daemon's own principal.
Any user able to pass `ui.filter` therefore received the full configuration, including principals that
Nimbus itself would have refused. 

Mitigation

Upgrade to 3.1.0, where credential-bearing values are masked before the configuration is served and where
every UI API endpoint must declare its authorization explicitly.

Users who cannot upgrade immediately should place the UI behind an authenticating reverse proxy that
restricts `/api/v1/cluster/configuration`, and should rotate the ZooKeeper authentication payload and any
TLS keystore or truststore passwords that were reachable through it.

Credit

The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
6.5 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-522Insufficiently Protected Credentials
CWE-862Missing Authorization
Timeline
Published14 Sep 2026
Updated4 Nov 2026
First seen14 Sep 2026
Sources
CVE-2026-82433 · MITRE
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