LycheeOrg Lychee up to 7.5.x Gallery View config/markdown.php cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in LycheeOrg Lychee up to 7.5.x. This affects an unknown function of the file config/markdown.php of the component Gallery View. The manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2026-57568. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in LycheeOrg Lychee up to 7.5.x. This issue affects an unknown code of the file config/markdown.php of the component Gallery View. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

Lychee is a free, open-source photo-management tool. Prior to 7.6.0, Lychee permits an authenticated user with album-edit permissions to store a javascript URI in an album or photo Markdown description because config/markdown.php enables allow_unsafe_links. app/Http/Resources/Models/Utils/PreformattedPhotoData.php and app/Http/Resources/Models/Utils/PreFormattedAlbumData.php convert the description to HTML, and the gallery components PhotoDetails.vue, Overlay.vue, PhotoThumb.vue, AlbumHero.vue, and AlbumCard.vue render that HTML with v-html. A visitor, including an unauthenticated visitor to a public album, who clicks the rendered link executes attacker-controlled JavaScript in the Lychee origin, which can expose session data or enable authenticated requests in the victim's context. This gallery-view flaw is distinct from CVE-2026-33738, which addressed feed rendering. This issue is fixed in version 7.6.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-57568 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

By approaching the search of inurl:config/markdown.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 7.6.0 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• LycheeOrg

Name

• Lychee

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5

Website

• Product: https://github.com/LycheeOrg/Lychee/

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