XSS in Lycheeorg Lychee
CVE-2026-33738
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
- Lycheeorg Lychee — versions < 7.5.3
Weakness classification (CWE)
References
- github.com/LycheeOrg/Lychee/security/advisories/GHSA-5574-7f3r-hm9j (Exploit, Vendor Advisory)
- github.com/LycheeOrg/Lychee/pull/4218 (Issue Tracking)
- github.com/LycheeOrg/Lychee/commit/d2e2606a0223d5a384d5b806db1b31eb587adc5c (Patch)
- github.com/LycheeOrg/Lychee/releases/tag/v7.5.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-33738?
- CVE-2026-33738 is a medium-severity vulnerability in Lycheeorg Lychee, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-26.
- How severe is CVE-2026-33738?
- Medium severity. CVSS v3 base score is 5.4 out of 10.