XSS in Lucee
CVE-2026-29519
Lucee CFML Server versions across the 5.3.x, 6.1.x, 6.2.x, and 7.0.x release lines contain a reflected cross-site scripting vulnerability in URL path parsing that allows unauthenticated remote attackers to execute arbitrary JavaScript in a victim's browser by embedding HTML or JavaScript payloads within the request path. Attackers can craft a malicious URL containing injected script content that is reflected in the server's response without proper output encoding, enabling session hijacking or unauthorized actions against the Lucee administrative interface when a victim visits the crafted link.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.004 (32.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.
Affected products
- Lucee — versions 5.3.1.95
Weakness classification (CWE)
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (technical-description, exploit)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-29519?
- CVE-2026-29519 is a high-severity vulnerability in Lucee, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2026-07-10.
- How severe is CVE-2026-29519?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2026-29519 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.