CVE-2026-61838

8.2High

Published 15 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

8.2High

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Impact: High impact on confidentiality
Weakness: CWE-285, CWE-639

Impact

Unauthenticated attackers can download full-resolution photos and metadata from password-protected albums without entering a password. They only need network access to the API and the target album's identifier.

Root cause

The /api/v2/Zip endpoint verifies download permissions using AlbumPolicy::canDownload() and PhotoPolicy::canDownload() without first verifying overall album access via AlbumPolicy::canAccess().

Affected systems

Lychee prior to 7.6.3

CVSS v4.0 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Fix & remediation

Upgrade Lychee to version 7.6.3. As an interim workaround, disable the 'grants_download' setting on password-protected albums.

shell

$ git pull origin master && composer install --no-dev

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

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.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-61838