CVE-2026-35565Network attack vector

Authenticated operator-session script execution via unescaped topology metadata

Published Apr 13, 2026 · Updated Apr 13, 2026

Stored XSS in Apache Storm UI before 2.8.6 allows remote authenticated users to execute scripts through crafted topology metadata. The parseNode() and parseEdge() functions place component IDs, stream names, and grouping values into tooltip HTML with innerHTML without escaping them. Exploitation requires topology-submission rights and an operator or administrator to view the stored visualization, exposing that browser session to attacker-controlled script execution.

CVSS severity5.4
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Apache Storm UI before 2.8.6 allows remote authenticated users to execute scripts through crafted topology metadata. The parseNode() and parseEdge() functions place component IDs, stream names, and grouping values into tooltip HTML with innerHTML without escaping them. Exploitation requires topology-submission rights and an operator or administrator to view the stored visualization, exposing that browser session to attacker-controlled script execution.

The record

CVE
CVE-2026-35565
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
The Apache Software Foundation
Product
Apache Storm UI
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.8.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Storm UIversion=0 <2.8.6

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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