Instaclustr Cassandra-Lucene-Index allows bypass of Cassandra RBAC

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2025-26511: 0.57% estimated exploitation activity in the next 30 days; percentile 47.52 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary / Details Systems running the Instaclustr fork of Stratio's Cassandra-Lucene-Index plugin versions 4.0-rc1-1.0.0 through 4.0.16-1.0.0 and 4.1.0-1.0.0 through 4.1.8-1.0.0, installed into Apache Cassandra version 4.x, are susceptible to a vulnerability which when successfully exploited could allow authenticated Cassandra users to remotely bypass RBAC to access data and and escalate their privileges. Affected Versions - Cassandra-Lucene-Index plugin versions 4.0-rc1-1.0.0 through 4.0.16-1.0.0 - versions 4.1.0-1.0.0 through 4.1.8-1.0.0 when installed into Apache Cassandra version 4.x. Required Configuration for Exploit These are the conditions required to enable exploit: 1. Cassandra 4.x 2. Vulnerable version of the Cassandra-Lucene-Index plugin configured for use 3. Data added to tables 4. Lucene index created 5. Cassandra flush has run Mitigation/Prevention Mitigation requires dropping all Lucene indexes and stopping use of the plugin. Exploit will be possible any time the…

Published by the source

13 Feb 2025, 17:16 UTC

Last modified by the source

22 Jan 2026, 21:47 UTC

Source last checked

26 Oct 2026, 16:44 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-mrqp-q7vx-v2cx

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-26511

Advisory: Instaclustr Cassandra-Lucene-Index allows bypass of Cassandra RBAC
IDs: CVE-2025-26511, GHSA-mrqp-q7vx-v2cx
Record: https://patchnext.com/advisories/cve-2025-26511 (revision 1, source checked 26 Oct 2026, 16:44 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: com.instaclustr:cassandra-lucene-index-plugin 4.1.8-1.0.1, 4.0.17-1.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.instaclustr:cassandra-lucene-index-plugin: affected >= 4.0-rc1-1.0.0, < 4.0.17-1.0.0; >= 4.1.0-1.0.0, < 4.1.8-1.0.1; fixed in 4.0.17-1.0.0, 4.1.8-1.0.1

## Suggested inspection (read-only)
- Maven com.instaclustr:cassandra-lucene-index-plugin: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on com.instaclustr:cassandra-lucene-index-plugin.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-mrqp-q7vx-v2cx (GitHub-reviewed advisory GHSA-mrqp-q7vx-v2cx lists affected ranges: Maven com.instaclustr:cassandra-lucene-index-plugin >=4.0-rc1-1.0.0 =4.1.0-1.0.0 <4.1.8-1.0.1)

Commands are suggestions: review each one before running it.