CVE-2026-57999Public exploitNetwork attack vector

Authenticated root command execution via shell substitution

Published Jun 29, 2026 · Updated Jun 29, 2026

Command injection in OpenWrt luci-app-tailscale-community 0.11.1 and earlier allows remote authenticated users to execute commands as root. The tailscale.do_login RPC inserts user-controlled loginserver and loginserver_authkey values into a command passed through an outer double-quoted /bin/sh -c string, so command substitutions are evaluated before the intended argument quoting. Exploitation requires the package ACL, Tailscale to be installed, and the service to be logged out or in the NeedsLogin state; successful execution gains root privileges.

CVSS severity9.9
Critical
EPSS probability2.28%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in OpenWrt luci-app-tailscale-community 0.11.1 and earlier allows remote authenticated users to execute commands as root. The tailscale.do_login RPC inserts user-controlled loginserver and loginserver_authkey values into a command passed through an outer double-quoted /bin/sh -c string, so command substitutions are evaluated before the intended argument quoting. Exploitation requires the package ACL, Tailscale to be installed, and the service to be logged out or in the NeedsLogin state; successful execution gains root privileges.

The record

CVE
CVE-2026-57999
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
OpenWrt
Product
LuCI
Classifications
CWE-78, T1059.004, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <=0.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenWrt · LuCIversion=0 <=0.11.1

Published CVSS scores

9.9OpenWrtCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell
T1068Exploitation for Privilege Escalation

Public exploit references

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

Technologies

Your stack

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Your stack

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