CVE-2026-61838
HIGH 8.2Lychee 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.
Severe if exploited (CVSS 8.2), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 36th percentile
Impact if exploited
8.2CVSS 4.0 · HIGH
- ConfidentialityHigh
- IntegrityNone
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ⚠Requirements: Specific conditions must be present
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-285: : Improper Authorization
- CWE-639: : Authorization Bypass Through User-Controlled Key
CVSS vector
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
References and research data (JSON)
All CVSS metrics
- HIGH 8.2 v4.0 · CNA Primary
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 - HIGH 8.2 v4.0 · NVD Secondary
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
References
Exploit-tagged references (not proof of a PoC)
- https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-735c-2wqc-x29r CVE record · GitHub_M · Updated 2026-10-15T16:32:37.392Z
CVE record · CISA-ADP · Updated 2026-10-15T18:31:13.925Z
NVD · CVE-2026-61838 · Updated 2026-10-15T21:08:49.703
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-102191 EUVD · EUVD-2026-102191
Technical & other
- https://github.com/LycheeOrg/Lychee/pull/4459 CVE record · GitHub_M · Updated 2026-10-15T16:32:37.392Z
NVD · CVE-2026-61838 · Updated 2026-10-15T21:08:49.703 - https://github.com/LycheeOrg/Lychee/commit/4366dd0e721126dffe29659afec93aee9c1db711 CVE record · GitHub_M · Updated 2026-10-15T16:32:37.392Z
NVD · CVE-2026-61838 · Updated 2026-10-15T21:08:49.703 - https://github.com/LycheeOrg/Lychee/releases/tag/v7.6.3 CVE record · GitHub_M · Updated 2026-10-15T16:32:37.392Z
NVD · CVE-2026-61838 · Updated 2026-10-15T21:08:49.703