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CVE-2026-35565

Medium

Low Medium High Critical

5.4

CVSS Score

Published: Apr 13, 2026

Last Modified: Apr 15, 2026

CWE: CWE-79

Vulnerability 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.

CVSS Metrics

Common Vulnerability Scoring System

Vector String:

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Known Affected Software

6 configuration(s) from 1 vendor(s)

storm

Version:

2.0.0

CPE:

cpe:2.3:a:apache:storm:2.0.0:*:*:*:*:*:*:*

storm

Version:

2.1.0

CPE:

cpe:2.3:a:apache:storm:2.1.0:*:*:*:*:*:*:*

storm

Version:

2.1.1

CPE:

cpe:2.3:a:apache:storm:2.1.1:*:*:*:*:*:*:*

storm

Version:

2.2.0

CPE:

cpe:2.3:a:apache:storm:2.2.0:*:*:*:*:*:*:*

storm

Version:

2.2.1

CPE:

cpe:2.3:a:apache:storm:2.2.1:*:*:*:*:*:*:*

storm

Version:

2.3.0

CPE:

cpe:2.3:a:apache:storm:2.3.0:*:*:*:*:*:*:*

This vulnerability affects 6 software configuration(s). Ensure you patch all affected systems.

References & Resources

Severity Details

5.4

out of 10.0

Medium

Weakness Type (CWE)

CWE-79 Top 25 #1

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Description: The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Exploit Likelihood: High
Typical Severity: Medium
OWASP Top 10: A03:2021-Injection
Abstraction Level: Base