Bug 2527318 (CVE-2026-32773)

Summary:	CVE-2026-32773 Apache Spark: Apache Spark: Cross-Site Scripting (XSS) leading to privilege escalation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	amctagga, aoconnor, bniver, flucifre, gmeno, groman, mbenjamin, mhackett, sostapov, vereddy
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in Apache Spark. The Spark History Server lacks proper Cross-Site Scripting (XSS) escaping, allowing a malicious Spark job to generate arbitrary unescaped frontend code. This vulnerability can be exploited by an attacker who has the ability to launch a Spark job and can trick a user with higher permissions into visiting the Spark history web page. Successful exploitation could lead to a minimal privilege escalation within the user's browser.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-02 11:04:55 UTC

There is a lack of XSS escaping in the Spark History Server prior to 3.5.8 which allows a malicious Spark job to generate arbitrary unescaped frontend code which could lead to a minimal privilege escalation in browser. Users are encouraged to upgrade to Spark 3.5.8 or later.

This CVE is marked as "low" since the path to exploit requires both relatively high permissions (ability to launch a Spark job) and requires tricking a user with higher permissions to log in and visit the Spark history web page.

Users are encouraged to upgrade their Spark history servers to Spark 3.5.8 or later.