Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in Shaarli - #VU128352
Published: April 28, 2026
Vulnerability identifier: #VU128352
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-80
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Shaarli
Affected software:
Shaarli
Shaarli
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary script in the victim's browser.
The vulnerability exists due to improper neutralization of script-related HTML tags in uploaded or embedded filenames in the filename rendering logic when rendering uploaded or embedded filenames in the DOM. A remote user can upload a file with a specially crafted filename to execute arbitrary script in the victim's browser.
The attack vector is limited by rendering context and browser behavior.
Remediation
Install security update from vendor's website.