CVE-2026-54442

MEDIUM 4.8

NationalSecurityAgency/emissary: Incomplete fix for CVE-2026-35571: SSRF

CVSS Score

4.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-918
Vendor	nationalsecurityagency
Product	emissary
Published	Nov 5, 2026
Last Updated	Nov 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

NationalSecurityAgency / emissary

< 8.51.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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