Disclosure summary
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.
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
GitHub Reviewed Security Advisories · GHSA-9437-39hj-3c93
Open original source · Updated Oct 05, 2026
Apache Spark History Server allows stored cross-site scripting through unescaped application names
Source severity: MEDIUM / 0
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| pip | pyspark | >= 3.0.0, < 3.5.8 | 3.5.8 |
| maven | org.apache.spark:spark-core_2.12 | >= 3.0.0, < 3.5.8 | 3.5.8 |
| maven | org.apache.spark:spark-core_2.13 | >= 3.0.0, < 3.5.8 | 3.5.8 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Reviewed advisory
PUBLISHED 2026-09-02T08:31:29-04:00
MODIFIED 2026-10-05T18:53:38-04:00
INGESTED 2026-10-06T11:45:33-04:00