# CVE-2026-77882: Lenovo System Update deserialization of untrusted data

Source: https://junglewise.ai/threats/cve-2026-77882-a-deserialization-of-untrusted-data-vulnerability-was-discovered  
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-2026-77882 · Severity: high · CVSS 7.8 · Published 2026-11-11

Lenovo System Update, which delivers software updates to Lenovo devices, contains a flaw that allows a local user with system access to run malicious code with elevated privileges. An attacker with a user account on an affected system could exploit this to gain administrative control and compromise the entire device.

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

## Quick answers

**Is CVE-2026-77882 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77882 being exploited in the wild.

**How severe is CVE-2026-77882?** High severity, with a CVSS score of 7.8, published 11 November 2026.

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

**Is there a fix for CVE-2026-77882?** 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-2026-77882 attacked?** It is attacked with local access, in a hosted service.

**Am I affected by CVE-2026-77882?** 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

A deserialization of untrusted data vulnerability (CWE-502) in Lenovo System Update allows local authenticated attackers to execute arbitrary code with elevated privileges. The vulnerability requires local access and prior authentication, but permits privilege escalation once exploited. A fix is available from the vendor.

## Affected products

- Lenovo System Update

## Timeline

- 2026-11-11: disclosed: CVE-2026-77882 published

## 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 improper permissions privilege escalation](https://junglewise.ai/threats/cve-2026-77873-an-improper-permissions-vulnerability-was-reported-in-lenovo)