TI-2026-27675 Aliases CVE-2026-35571 GHSA-cpm7-cfpx-3hvp

Emissary has Stored XSS via Navigation Template Link Injection

LOW 21CWE-79Published 2026-04-07 · Updated 2026-04-08

Key facts

Attack vector: Network
Privileges required: High
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

Emissary is a P2P based data-driven workflow engine. Prior to 8.39.0, Mustache navigation templates interpolated configuration-controlled link values directly into href attributes without URL scheme validation. An administrator who could modify the navItems configuration could inject javascript: URIs, enabling stored cross-site scripting (XSS) against other authenticated users viewing the Emissary web interface. This vulnerability is fixed in 8.39.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00182 7th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed emissary (NationalSecurityAgency): 8.39.0gov.nsa.emissary:emissary (Maven): 8.39.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
NationalSecurityAgency	emissary	before 8.39.0	8.39.0	Patch available	CNA
—	gov.nsa.emissary:emissary (Maven)	before 8.39.0	8.39.0	Patch available	GHSA-cpm7-cfpx-3hvp

emissary VendorNationalSecurityAgency Affected before 8.39.0 Fixed in 8.39.0 Patch available CNA
gov.nsa.emissary:emissary (Maven) Vendor— Affected before 8.39.0 Fixed in 8.39.0 Patch available GHSA-cpm7-cfpx-3hvp

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nsa:emissary::::::::	up to 8.38.0	Vulnerable	NationalSecurityAgency

cpe:2.3:a:nsa:emissary:*:*:*:*:*:*:*:* Versions up to 8.38.0 Vulnerable ·NationalSecurityAgency

Remediation

Fix · CNA emissary (NationalSecurityAgency) Fixed in 8.39.0
Fix · GHSA-cpm7-cfpx-3hvp gov.nsa.emissary:emissary (Maven) Fixed in 8.39.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-35571
2026-10-03 Alias added: GHSA-cpm7-cfpx-3hvp
2026-11-04 1 new reference · GHSA-cpm7-cfpx-3hvp

References

Other 3

TI-2026-27685 Emissary has an OS Command Injection via Unvalidated IN_FILE_ENDING / OUT_FILE_ENDING in Executrix CVSS 3.1HIGH 8.8
TI-2021-12315 Post-authentication Remote Code Execution (RCE) in emissary:emissary CVSS 3.1CRITICAL 9.1
TI-2021-12307 Server-Side Request Forgery (SSRF) in emissary:emissary CVSS 3.1CRITICAL 9.9
TI-2026-27683 Emissary has GitHub Actions Shell Injection via Workflow Inputs CVSS 3.1CRITICAL 9.1
TI-2021-12047 U.S. CVSS 3.1HIGH 8.8
TI-2021-12049 The ConsoleAction component of U.S. CVSS 3.1HIGH 8.8

See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences