What is CVE-2026-54442?

CVE-2026-54442 is a medium-severity vulnerability in Nationalsecurityagency Emissary, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.8/10. Published 2026-11-05.

How severe is CVE-2026-54442?

Medium severity. CVSS v3 base score is 4.8 out of 10.

SSRF in Nationalsecurityagency Emissary

CVE-2026-54442

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-11-05.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Nationalsecurityagency Emissary — versions < 8.51.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

Frequently asked questions

What is CVE-2026-54442?: CVE-2026-54442 is a medium-severity vulnerability in Nationalsecurityagency Emissary, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.8/10. Published 2026-11-05.
How severe is CVE-2026-54442?: Medium severity. CVSS v3 base score is 4.8 out of 10.