CVE-2021-44791 Reflected XSS on certain HTTP endpoints

What is CVE-2021-44791?

CVE-2021-44791 is a medium-severity cross-site scripting vulnerability in Apache Druid, published on 7 Jul 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

In Apache Druid 0.22.1 and earlier, certain specially-crafted links result in unescaped URL parameters being sent back in HTML responses. This makes it possible to execute reflected XSS attacks.

Weakness: CWE-79

Which versions are affected by CVE-2021-44791?

2 open source packages ship an affected version, including org.apache.druid:druid. It affects 1 product.

Products include Apache Druid.

How do I fix CVE-2021-44791?

Upgrade org.apache.druid:druid to 0.23.0 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-44791 being exploited?

There is no known exploitation of CVE-2021-44791 in the wild and no public exploit code.

Other vulnerabilities in Apache Druid

• CVE-2026-23906 Apache Druid: Authentication Bypass via LDAP Anonymous Bind Critical 9.8
• CVE-2025-59390 Apache Druid: Kerberos authenticaton chooses a cryptographically unsecure secret if not configured explicitly. Critical 9.8
• CVE-2021-26919 Apache Druid Authenticated users can execute arbitrary code from malicious MySQL database systems. High 8.8
• CVE-2021-25646 Authenticated users can override system configurations in their requests which allows them to execute arbitrary code. High 8.8
• CVE-2024-45537 Apache Druid: Users can provide MySQL JDBC properties not on allow list Medium 6.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8rmv-98m4-g5c6.