CVE-2026-54442

Description

Emissary is a P2P based data-driven workflow engine. Prior to 8.51.0, the VALID_LINK validation in src/main/java/emissary/server/mvc/NavAction.java accepts protocol-relative URLs when processing configured navigation links. Browser URL normalization can interpret these accepted strings as external origins. The authoritative advisory attributes open redirect, server-side request forgery, and cloud metadata access to this bypass, but it identifies neither the server-side dereference path nor how navigation-link processing reaches that path. This issue is fixed in version 8.51.0.

References

• https://github.com/NationalSecurityAgency/emissary/commit/e0179f7558cfb09a5bbc63a2f9fcb50f899768f6
• https://github.com/NationalSecurityAgency/emissary/releases/tag/8.51.0
• https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-c6q7-wqw2-h65w
• https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-c6q7-wqw2-h65w