CVE-2026-104474: Time-of-check Time-of-use (TOCTOU) Race Condition in litespeedtech openlitespeed
OpenLiteSpeed versions before 1.9.3 have a local privilege escalation vulnerability due to a TOCTOU race condition in the admin update script lsup.sh. This script runs update packages from a directory writable by the nobody user without verifying them, allowing an attacker controlling the nobody web process to replace the package before extraction and execute arbitrary code as root during the next update.
AI Analysis
Technical Summary
CVE-2026-104474 describes a time-of-check to time-of-use (TOCTOU) race condition vulnerability in OpenLiteSpeed before version 1.9.3. The vulnerability exists in the admin/misc/lsup.sh script, which runs update packages located in /usr/local/lsws/autoupdate/. This directory is writable by the nobody user, which the web process runs as. An attacker with control over the nobody web process can replace the update package before extraction, causing the install.sh script within the package to execute with root privileges during the next update cycle, resulting in local privilege escalation.
Potential Impact
An attacker with access to the nobody web process can escalate privileges to root by exploiting the race condition to run arbitrary code as root during the update process. This compromises the system's security by allowing full control over the server.
Mitigation Recommendations
A fixed version 1.9.3 or later is available that addresses this vulnerability. Users should upgrade OpenLiteSpeed to version 1.9.3 or above to remediate this issue. No other mitigation guidance is provided in the input data.
CVE-2026-104474: Time-of-check Time-of-use (TOCTOU) Race Condition in litespeedtech openlitespeed
Description
OpenLiteSpeed versions before 1.9.3 have a local privilege escalation vulnerability due to a TOCTOU race condition in the admin update script lsup.sh. This script runs update packages from a directory writable by the nobody user without verifying them, allowing an attacker controlling the nobody web process to replace the package before extraction and execute arbitrary code as root during the next update.
CVSS v4.0
Score 5.4medium
Affected software
litespeedtech
openlitespeed
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-104474 describes a time-of-check to time-of-use (TOCTOU) race condition vulnerability in OpenLiteSpeed before version 1.9.3. The vulnerability exists in the admin/misc/lsup.sh script, which runs update packages located in /usr/local/lsws/autoupdate/. This directory is writable by the nobody user, which the web process runs as. An attacker with control over the nobody web process can replace the update package before extraction, causing the install.sh script within the package to execute with root privileges during the next update cycle, resulting in local privilege escalation.
Potential Impact
An attacker with access to the nobody web process can escalate privileges to root by exploiting the race condition to run arbitrary code as root during the update process. This compromises the system's security by allowing full control over the server.
Mitigation Recommendations
A fixed version 1.9.3 or later is available that addresses this vulnerability. Users should upgrade OpenLiteSpeed to version 1.9.3 or above to remediate this issue. No other mitigation guidance is provided in the input data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-02T00:55:58.387Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac03ed7a43b0b3b891276dc
Added to database: 10/02/2026, 23:31:35 UTC
Last enriched: 10/02/2026, 23:47:33 UTC
Last updated: 10/03/2026, 03:08:01 UTC
Views: 6
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