What’s Vulnerable › Vulnerabilities

CVE-2026-33738: Lychee Vulnerable to Stored XSS via Photo Description in RSS/Atom/JSON Feed (No Sanitization on Public Endpoint)

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-26 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• LycheeOrg Lychee: before 7.5.3 — fixed in 7.5.3

How to fix

Upgrade to a fixed version: LycheeOrg Lychee 7.5.3. Check the vendor advisory for mitigations.

References

• https://github.com/LycheeOrg/Lychee/commit/d2e2606a0223d5a384d5b806db1b31eb587adc5c
• https://github.com/LycheeOrg/Lychee/pull/4218
• https://github.com/LycheeOrg/Lychee/releases/tag/v7.5.3
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-5574-7f3r-hm9j
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-5574-7f3r-hm9j

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