CVE-2026-35565
Apache Storm UI: Stored Cross-Site Scripting (XSS) via Unsanitized Topology Metadata in Storm UI
Description
Stored Cross-Site Scripting (XSS) via Unsanitized Topology Metadata in Apache Storm UI Versions Affected: before 2.8.6 Description: The Storm UI visualization component interpolates topology metadata including component IDs, stream names, and grouping values directly into HTML via innerHTML in parseNode() and parseEdge() without sanitization at any layer. An authenticated user with topology submission rights could craft a topology containing malicious HTML/JavaScript in component identifiers (e.g., a bolt ID containing an onerror event handler). This payload flows through Nimbus → Thrift → the Visualization API → vis.js tooltip rendering, resulting in stored cross-site scripting. In multi-tenant deployments where topology submission is available to less-trusted users but the UI is accessed by operators or administrators, this enables privilege escalation through script execution in an admin's browser session. Mitigation: 2.x users should upgrade to 2.8.6. Users who cannot upgrade immediately should monkey-patch the parseNode() and parseEdge() functions in the visualization JavaScript file to HTML-escape all API-supplied values including nodeId, :capacity, :latency, :component, :stream, and :grouping before interpolation into tooltip HTML strings, and should additionally restrict topology submission to trusted users via Nimbus ACLs as a defense-in-depth measure. A guide on how to do this is available in the release notes of 2.8.6. Credit: This issue was discovered while investigating another report by K.
INFO
Published Date :
April 13, 2026, 10:16 a.m.
Last Modified :
Oct. 26, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade Apache Storm UI to version 2.8.6 or later.
- HTML-escape interpolated API values in UI JavaScript.
- Restrict topology submission to trusted users.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-35565.
| URL | Resource |
|---|---|
| https://storm.apache.org/2026/04/12/storm286-released.html | Release Notes Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/04/12/7 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-35565 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-35565
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-35565 vulnerability anywhere in the article.
-
Daily CyberSecurity
High-Severity RCE and XSS Vulnerabilities Patched in Apache Storm 2.8.6
Apache Storm, the distributed realtime computation system known for processing unbounded streams of data, has released a critical security update. Version 2.8.6 addresses two significant vulnerabiliti ... Read more
The following table lists the changes that have been made to the
CVE-2026-35565 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: Apache Storm UI de Apache Software Foundation, Description: Cross-Site Scripting (XSS) Almacenado a través de Metadatos de Topología No Saneados en la Interfaz de Usuario de Apache Storm Versiones afectadas: anteriores a 2.8.6 Descripción: El componente de visualización de la interfaz de usuario de Storm interpola metadatos de topología, incluyendo IDs de componentes, nombres de flujos y valores de agrupación, directamente en HTML a través de innerHTML en parseNode() y parseEdge() sin saneamiento en ninguna capa. Un usuario autenticado con derechos de envío de topología podría crear una topología que contenga HTML/JavaScript malicioso en identificadores de componentes (por ejemplo, un ID de bolt que contenga un gestor de eventos onerror). Esta carga útil fluye a través de Nimbus ? Thrift ? la API de visualización ? la renderización de tooltips de vis.js, lo que resulta en cross-site scripting almacenado. En implementaciones multi-inquilino donde el envío de topologías está disponible para usuarios menos confiables pero la interfaz de usuario es accedida por operadores o administradores, esto permite la escalada de privilegios a través de la ejecución de scripts en la sesión del navegador de un administrador. Mitigación: Los usuarios de 2.x deberían actualizar a 2.8.6. Los usuarios que no puedan actualizar inmediatamente deberían aplicar un monkey-patch a las funciones parseNode() y parseEdge() en el archivo JavaScript de visualización para escapar en HTML todos los valores proporcionados por la API, incluyendo nodeId, :capacity, :latency, :component, :stream y :grouping, antes de la interpolación en cadenas HTML de tooltip, y deberían restringir adicionalmente el envío de topologías a usuarios de confianza a través de ACL de Nimbus como medida de defensa en profundidad. Una guía sobre cómo hacer esto está disponible en las notas de la versión 2.8.6. Crédito: Este problema fue descubierto mientras se investigaba otro informe de K. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apache Software Foundation', 'product': 'Apache Storm UI', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.8.6', 'versionType': 'semver'}], 'packageName': 'org.apache.storm:storm-webapp', 'collectionURL': 'https://repo.maven.apache.org/maven2/', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-35565', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-04-13T14:09:39.740938Z'} -
Initial Analysis by [email protected]
Apr. 15, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (excluding) 2.8.6 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/04/12/7 Types: Mailing List, Third Party Advisory Added Reference Type Apache Software Foundation: https://storm.apache.org/2026/04/12/storm286-released.html Types: Release Notes, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N -
New CVE Received by [email protected]
Apr. 13, 2026
Action Type Old Value New Value Added Description Stored Cross-Site Scripting (XSS) via Unsanitized Topology Metadata in Apache Storm UI Versions Affected: before 2.8.6 Description: The Storm UI visualization component interpolates topology metadata including component IDs, stream names, and grouping values directly into HTML via innerHTML in parseNode() and parseEdge() without sanitization at any layer. An authenticated user with topology submission rights could craft a topology containing malicious HTML/JavaScript in component identifiers (e.g., a bolt ID containing an onerror event handler). This payload flows through Nimbus → Thrift → the Visualization API → vis.js tooltip rendering, resulting in stored cross-site scripting. In multi-tenant deployments where topology submission is available to less-trusted users but the UI is accessed by operators or administrators, this enables privilege escalation through script execution in an admin's browser session. Mitigation: 2.x users should upgrade to 2.8.6. Users who cannot upgrade immediately should monkey-patch the parseNode() and parseEdge() functions in the visualization JavaScript file to HTML-escape all API-supplied values including nodeId, :capacity, :latency, :component, :stream, and :grouping before interpolation into tooltip HTML strings, and should additionally restrict topology submission to trusted users via Nimbus ACLs as a defense-in-depth measure. A guide on how to do this is available in the release notes of 2.8.6. Credit: This issue was discovered while investigating another report by K. Added CWE CWE-79 Added Reference https://storm.apache.org/2026/04/12/storm286-released.html -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Apr. 13, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/12/7