Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Spark | >= 3.0.0, < 3.5.8 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/k36prh3oxl1z6ov7w8rpmfnt07hmzw3vMailing ListVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/09/01/4Mailing ListThird Party Advisory
FAQ
What is CVE-2026-32773?
CVE-2026-32773 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 esca...
How severe is CVE-2026-32773?
CVE-2026-32773 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-32773?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Spark.