CVE-2019-17557 Cross-site scripting in Apache Syncome EndUser

What is CVE-2019-17557?

CVE-2019-17557 is a medium-severity cross-site scripting vulnerability in Apache Syncope, published on 4 May 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

It was found that the Apache Syncope EndUser UI login page prio to 2.0.15 and 2.1.6 reflects the successMessage parameters. By this mean, a user accessing the Enduser UI could execute javascript code from URL query string.

Weakness: CWE-79

Which versions are affected by CVE-2019-17557?

4 open source packages ship an affected version, including org.apache.syncope.client:syncope-client-enduser. It affects 1 product.

Products include Apache Syncope.

How do I fix CVE-2019-17557?

Upgrade org.apache.syncope.client:syncope-client-enduser to a fixed version for your release line: 2.0.15 or 2.1.6.

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-2019-17557 being exploited?

There is no known exploitation of CVE-2019-17557 in the wild and no public exploit code.

Other vulnerabilities in Apache Syncope

• CVE-2026-53405 Apache Syncope: Remote Code Execution via Flowable BPMN Groovy ScriptTask Critical 9.8
• CVE-2026-53421 Apache Syncope: Remote Code Execution via Scripted Connector Critical 9.8
• CVE-2026-57308 Apache Syncope: SQL injection vulnerability in Audit Events search Critical 9.8
• CVE-2026-62183 Apache Syncope: User self-service privilege escalation Critical 9.8
• CVE-2026-63071 Apache Syncope: RCE via Groovy Sandbox bypass Critical 9.8

Sources

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

Also known as GHSA-6qj8-c27w-rp33.