Medium [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 escalation in browser
This medium-severity Apache Software Foundation advisory covers CVE-2026-32773; related products: Apache Spark.
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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.
Affected product named by the advisory: Apache Spark.
- Apache Spark 3.0.0 before 3.5.8
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Users are encouraged to upgrade to Spark 3.5.8 or later.
- Users are encouraged to upgrade their Spark history servers to Spark 3.5.8 or later.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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