CVE-2026-77466
HIGH 8.3Lychee is a free, open-source photo-management tool. Prior to 7.7.0, Lychee hides the Omnipay Dummy test provider from the checkout options in production through OmnipayFactory::get_supported_providers(), but CreateSessionRequest validates only that the submitted provider is an OmnipayProviderType and does not enforce OmnipayProviderType::isAllowed(). A buyer, including a guest when webshop_allow_guest_checkout is enabled, can submit Dummy directly and complete the test gateway flow without a real payment. When webshop_auto_fulfill_enabled is enabled, OrderCompletedListener::fullfillOrder() can then release the purchasable item. The issue requires access to the Supporter or Pro webshop and an enabled purchasable item. Testing bypassed the closed-source license middleware, so whether the real license layer performs additional payment-provider validation remains unverified. The payment finalize status check itself is not the root cause. This issue is fixed in version 7.7.0.
Severe if exploited (CVSS 8.3), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 38th percentile
Impact if exploited
8.3CVSS 4.0 · HIGH
- ConfidentialityLow
- IntegrityHigh
- 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-20: : Improper Input Validation
- CWE-184: : Incomplete List of Disallowed Inputs
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
References and research data (JSON)
All CVSS metrics
- HIGH 8.3 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N - HIGH 8.3 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/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-5wh2-hg7q-6hv3 CVE record · GitHub_M · Updated 2026-10-15T16:36:58.410Z
CVE record · CISA-ADP · Updated 2026-10-15T17:57:21.560Z
NVD · CVE-2026-77466 · Updated 2026-10-15T21:08:49.703
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-102197 EUVD · EUVD-2026-102197
Technical & other
- https://github.com/LycheeOrg/Lychee/pull/4507 CVE record · GitHub_M · Updated 2026-10-15T16:36:58.410Z
NVD · CVE-2026-77466 · Updated 2026-10-15T21:08:49.703 - https://github.com/LycheeOrg/Lychee/commit/8b73656f920c682862b9199acc87fbaf72ee5a90 CVE record · GitHub_M · Updated 2026-10-15T16:36:58.410Z
NVD · CVE-2026-77466 · Updated 2026-10-15T21:08:49.703 - https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.0 CVE record · GitHub_M · Updated 2026-10-15T16:36:58.410Z
NVD · CVE-2026-77466 · Updated 2026-10-15T21:08:49.703