CVE-2026-32773Network attack vectorHinoki check available

Browser script execution via unescaped job event data

Published Sep 2, 2026 · Updated Sep 2, 2026

Stored XSS in Apache Spark History Server 3.0.0 through 3.5.7 allows remote authenticated users to run script in a viewer's browser. The server replays a malicious job's event data into History Server frontend output without XSS escaping, causing the browser to interpret embedded code. Exploitation requires permission to launch a Spark job and user interaction from a more privileged user who visits the affected history page.

CVSS severity6.1
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Apache Spark History Server 3.0.0 through 3.5.7 allows remote authenticated users to run script in a viewer's browser. The server replays a malicious job's event data into History Server frontend output without XSS escaping, causing the browser to interpret embedded code. Exploitation requires permission to launch a Spark job and user interaction from a more privileged user who visits the affected history page.

The record

CVE
CVE-2026-32773
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
The Apache Software Foundation
Product
Apache Spark
Classifications
CWE-80, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 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=3.0.0 <3.5.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Sparkversion=3.0.0 <3.5.8

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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