# CVE-2026-77873: Lenovo System Update improper permissions privilege escalation

Source: https://junglewise.ai/threats/cve-2026-77873-an-improper-permissions-vulnerability-was-reported-in-lenovo  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-11. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

CVE-2026-77873 · Severity: high · CVSS 7.3 · Published 2026-11-11

Lenovo System Update, a tool that keeps Lenovo computers updated with security patches and driver improvements, contains an improper permissions flaw. A local user with valid system access could exploit this vulnerability to run malicious code with elevated administrator privileges, potentially gaining complete control over the affected computer.

Vendors: [Lenovo](https://junglewise.ai/threats/vendors/lenovo).

## Quick answers

**Is CVE-2026-77873 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77873 being exploited in the wild.

**How severe is CVE-2026-77873?** High severity, with a CVSS score of 7.3, published 11 November 2026.

**Which products and versions are affected?** Lenovo System Update.

**Is there a fix for CVE-2026-77873?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-77873 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-77873?** Check whether you run Lenovo System Update. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an improper permissions issue in Lenovo System Update that allows authenticated local users to execute arbitrary code with elevated privileges. It requires local access and valid user credentials but does not require user interaction. A successful exploit results in privilege escalation, granting the attacker administrative control over the system.

## Affected products

- Lenovo System Update

## Timeline

- 2026-11-11: disclosed

## References

- [https://support.lenovo.com/us/en/downloads/ds012808](https://support.lenovo.com/us/en/downloads/ds012808)
- [https://support.lenovo.com/us/en/product_security/LEN-232748](https://support.lenovo.com/us/en/product_security/LEN-232748)

## Related threats

- [Lenovo System Update deserialization of untrusted data](https://junglewise.ai/threats/cve-2026-77882-a-deserialization-of-untrusted-data-vulnerability-was-discovered)