CVE-2026-61838

Lychee is a free, open-source photo-management tool. Prior to 7.6.3, GET /api/v2/Zip authorizes album and photo archives through AlbumPolicy::canDownload() and PhotoPolicy::canDownload() without first enforcing AlbumPolicy::canAccess(). For a public, password-protected album with grants_download enabled, an unauthenticated attacker who knows the shared album identifier can download a ZIP archive without supplying the password or unlocking the album, even though browsing endpoints deny access. The archive exposes the album's photos and can include full-resolution originals and associated metadata when grants_full_photo_access is enabled. This issue is fixed in version 7.6.3.

• https://github.com/LycheeOrg/Lychee/commit/4366dd0e721126dffe29659afec93aee9c1db711
• https://github.com/LycheeOrg/Lychee/pull/4459
• https://github.com/LycheeOrg/Lychee/releases/tag/v7.6.3
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-735c-2wqc-x29r
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-735c-2wqc-x29r