Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS
CVE-2026-77873 Overview
An improper permissions vulnerability was reported in Lenovo System Update that could allow a local authenticated user to execute code with elevated privileges.
Critical Impact
Affected Products
- Product named in vendor advisory: see the vendor advisory for the exact affected versions
Discovery Timeline
- 2026-11-11: CVE-2026-77873 published to the National Vulnerability Database by psirt@lenovo.com
- 2026-11-11: last updated in the NVD database
Technical Details for CVE-2026-77873
Vulnerability Analysis
CVE-2026-77873 is a Incorrect Default Permissions weakness (CWE-276: Incorrect Default Permissions) in Product named in vendor advisory. Based on its CVSS vector, the flaw needs local or adjacent access, needs some level of access, and relies on a user taking an action. Files or resources are installed with permissions that are too open.
With a CVSS base score of 7, apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Root Cause
The weakness is classified as CWE-276: Incorrect Default Permissions. Files or resources are installed with permissions that are too open.
Attack Vector
Based on the CVSS vector, the flaw needs local or adjacent access, needs some level of access, and relies on a user taking an action. Attack complexity is low complexity.
No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Detection Methods for CVE-2026-77873
Detection Strategies
- Inventory every instance of Product named in vendor advisory and compare the running version with the affected range above.
- Check external attack surface scans for internet facing instances of the component.
- Run an authenticated vulnerability scan once your scanner ships a check for this CVE.
Monitoring Recommendations
- Forward Product named in vendor advisory application, access and audit logs to your SIEM for retrospective hunting.
- Alert on new processes, configuration changes or outbound connections from the affected service.
- Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.
How to Mitigate CVE-2026-77873
Immediate Actions Required
- Apply the fixed version of Product named in vendor advisory named in the vendor advisory.
- Prioritize internet facing and business critical instances first.
- Rescan after the change to confirm the exposure is closed.
Patch Information
Use the fixed version listed in the vendor advisory for Product named in vendor advisory.
Workarounds
- If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.
CWE References
- CWE-276: Incorrect Default Permissions More CVEs with this weakness
Technical References
This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.
Frequently asked questions
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