CVE-2026-33738 PUBLISHED

Lychee Vulnerable to Stored XSS via Photo Description in RSS/Atom/JSON Feed (No Sanitization on Public Endpoint)

Assigner: GitHub_M
Reserved: 23.03.2026 Published: 26.03.2026 Updated: 27.03.2026

Lychee is a free, open-source photo-management tool. Prior to version 7.5.3, the photo description field is stored without HTML sanitization and rendered using {!! $item->summary !!} (Blade unescaped output) in the RSS, Atom, and JSON feed templates. The /feed endpoint is publicly accessible without authentication, allowing any RSS reader to execute attacker-controlled JavaScript. Version 7.5.3 fixes the issue.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:H/SI:L/SA:N
CVSS Score: 4.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	High
Attack Complexity	Low	Integrity	Low	Integrity	Low
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	LycheeOrg
Product	Lychee
Versions	Version < 7.5.3 is affected

References

Problem Types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE