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

Medium 4.8 Published 26 Mar 2026 Updated 27 Mar 2026

Attackers can inject malicious JavaScript into photo descriptions, which executes in victims' browsers when viewing public RSS or Atom feeds.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-33738?

CVE-2026-33738 is a medium-severity cross-site scripting vulnerability in LycheeOrg Lychee, published on 26 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2026-33738?

It affects 1 product.

Products include Lycheeorg Lychee.

How do I fix CVE-2026-33738?

No fix has been published for CVE-2026-33738 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-33738 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33738 exists.

Sources

Also known as GHSA-5574-7f3r-hm9j.