CVE
A deserialization of untrusted data vulnerability was discovered in Lenovo System Update that could allow a local authenticated user to…
Affects Lenovo System Update up to and including 5.08.03.59. No fix will be released, so Lenovo advises uninstalling it and moving to Lenovo Commercial Vantage.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- See vendor advisory
- Who is exposed
- Specific setups only
Do first: Workaround: Uninstall Lenovo System Update and migrate to Lenovo Commercial Vantage.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 19/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
A deserialization flaw in Lenovo System Update lets a local user with low-privilege login run code with elevated privileges. The attacker must already have access to the machine, and no user action is needed to trigger it.
Read the original description
A deserialization of untrusted data vulnerability was discovered in Lenovo System Update that could allow a local authenticated user to execute code with elevated privileges.
Who should check
Anyone running Lenovo System Update on Lenovo systems; teams should uninstall it and migrate to Lenovo Commercial Vantage.
Not fixed by: No update will be released for this issue; uninstalling is the remedy.
Read the source excerpt
“As of October 31, 2026, Lenovo System Update has reached end of support status”
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure5/25Specific setups only
- Reach?/20Unknown. No tracked technology or package matched
- Severity8.5/10CVSS 8.5
- No patch5/5No fixed version listed; see vendor advisory
What would change the score
- Would score about 69 if added to CISA KEV
- Would score about 64 if CISA's SSVC rates exploitation active
- Would score about 29 if CISA's SSVC rates it automatable
What to do
Workaround: Uninstall Lenovo System Update and migrate to Lenovo Commercial Vantage.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-77882 (A deserialization of untrusted data vulnerability was discovered in Lenovo System Update that could allow a local authenticated user to…), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-77882 (entry last updated 2026-11-11):
Affected:
- Lenovo System Update: through 5.08.03.59
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: local access, low-privilege login, no user action.
Workaround: Uninstall Lenovo System Update and migrate to Lenovo Commercial Vantage. (source: https://www.cve.org/CVERecord?id=CVE-2026-77882)
CISA KEV: CVE-2026-77882 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-77882 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://support.lenovo.com/us/en/product_security/LEN-232748
- https://support.lenovo.com/us/en/downloads/ds012808
- https://www.cve.org/CVERecord?id=CVE-2026-77882
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-77882
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-77882"}.Timeline
- CVE published
- First seen by cve.now
Affected versions
- Lenovo System Update
through 5.08.03.59
Evidence 4
Vendor advisory · 2
Establishes: Affected and fixed versions.
- Advisory
- Link
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-77882
Is CVE-2026-77882 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-77882?
System Update: through 5.08.03.59.Source: cve.now feed data
How do I fix CVE-2026-77882?
No fixed version is listed. Uninstall Lenovo System Update and migrate to Lenovo Commercial Vantage.Source: cve.org
What if there's no patch?
Lenovo says no further updates will be released for these vulnerabilities. The workaround is to uninstall Lenovo System Update and switch to Lenovo Commercial Vantage.Source: cve.org