GHSA-9437-39hj-3c93: pyspark (CVE-2026-32773)

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 e...

CVSS 6.1 MediumEPSS 0.0041 · 36th percentile

Published by the GitHub Advisory Database at 2 Sept 2026, 11:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
pyspark	PyPI	>=3.0.0, <3.5.8	3.5.8

Identifiers

GHSA-9437-39hj-3c93 · BIT-spark-2026-32773 · CVE-2026-32773 · PYSEC-2026-3966

Weakness (CWE)

CWE-80

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The pyspark package versions 3.0.0 up to 3.5.8 (not including 3.5.8) are affected by missing XSS escaping in the Spark History Server. An attacker who can launch a Spark job can inject unescaped frontend code, which may give limited privilege escalation in a browser if a user with higher permissions is tricked into visiting the history page. Upgrade to pyspark 3.5.8 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.1	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	OSV

CISA KEV Not listed.
EPSS 0.0041, the 36th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:08 UTC First seen by agentprime
31 Oct 2026, 14:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.