CVE-2026-49959Network attack vectorHinoki check available

Authenticated command execution via executable Git configuration

Published Jun 9, 2026 · Updated Jun 9, 2026

OS command injection in Nathan Esquenazi Hermes WebUI before 0.51.311 allows remote authenticated users to execute host commands. api/workspace_git.py invokes Git without overriding executable repository configuration or scrubbing command-bearing Git environment variables. An authenticated user able to place a malicious .git/config in a workspace can trigger commands through status or fetch operations with the WebUI server's privileges.

CVSS severity8.7
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

OS command injection in Nathan Esquenazi Hermes WebUI before 0.51.311 allows remote authenticated users to execute host commands. api/workspace_git.py invokes Git without overriding executable repository configuration or scrubbing command-bearing Git environment variables. An authenticated user able to place a malicious .git/config in a workspace can trigger commands through status or fetch operations with the WebUI server's privileges.

The record

CVE
CVE-2026-49959
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Nathan Esquenazi
Product
Hermes WebUI
Classifications
CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.51.311

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nathan Esquenazi · Hermes WebUIversion=0 <0.51.311

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo