CVE-2026-35571: Emissary is a P2P based data-driven workflow engine

Q: How do I fix CVE-2026-35571?

emissary: upgrade to newer than 8.38.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-35571 being exploited?

CVE-2026-35571 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35571 affect?

CVE-2026-35571 affects emissary. Severity is medium (CVSS 4.8). 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 mo

Q: How urgent is CVE-2026-35571?

Priority 24/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2026-35571 is a medium-severity flaw (CVSS 4.8) affecting emissary. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 8.3

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: nsa

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 16:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

nsa emissary UPGRADE

Affected: <= 8.38.0

Fixed in: newer than 8.38.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy emissary || rpm -q emissary || emissary --version

2. UPGRADE to newer than 8.38.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade emissary

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade emissary

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35571?

emissary: upgrade to newer than 8.38.0. Exact commands for each OS are on this page.

Is CVE-2026-35571 being exploited?

CVE-2026-35571 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35571 affect?

CVE-2026-35571 affects emissary. Severity is medium (CVSS 4.8). 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 mo

How urgent is CVE-2026-35571?

Priority 24/100. Public exploit reference

Related CVEs

CVE-2026-35582 HIGH 8.8 UPGRADE Emissary is a P2P based data-driven workflow engine
CVE-2026-35580 CRITICAL 9.1 UPGRADE Emissary is a P2P based data-driven workflow engine
CVE-2026-35581 HIGH 7.2 UPGRADE Emissary is a P2P based data-driven workflow engine
CVE-2026-35583 MEDIUM 5.3 UPGRADE Emissary is a P2P based data-driven workflow engine

References

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