Authenticated root command execution via cron injection
Published Aug 17, 2026 · Updated Aug 19, 2026
Code injection in Language Update in GL.iNet router firmware 4.8.x and earlier allows remote authenticated users to execute commands as root. The ui.update_langs RPC method accepts hour, min, and week values without enforcing numeric input and writes them into gl_timer, allowing injected cron content to be executed. Exploitation requires network reachability to the management RPC interface and low privileges; successful use grants root-level control over router settings, files, and scheduled tasks.
Summary
What happened
Code injection in Language Update in GL.iNet router firmware 4.8.x and earlier allows remote authenticated users to execute commands as root. The ui.update_langs RPC method accepts hour, min, and week values without enforcing numeric input and writes them into gl_timer, allowing injected cron content to be executed. Exploitation requires network reachability to the management RPC interface and low privileges; successful use grants root-level control over router settings, files, and scheduled tasks.
The record
- CVE
- CVE-2026-19980
- Published
- Aug 17, 2026
- Updated
- Aug 19, 2026
- Vendor
- GL.iNet
- Product
- Slate Plus (GL-A1300)
- Classifications
- CWE-74, CWE-94, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 17, 2026CVE publishedPublication date reported by the CVE source.
- Aug 19, 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.
- Affected versionversion=4.0
- Affected versionversion=4.1
- Affected versionversion=4.2
- Affected versionversion=4.3
- Affected versionversion=4.4
- Affected versionversion=4.5
- Affected versionversion=4.6
- Affected versionversion=4.7
- Affected versionversion=4.8
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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