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highRemote Code Execpublic exploit

CVE-2026-50602

CVE-2026-50602 — Planet9 Incorrect Permission Assignment Vulnerability Information

A security vulnerability has been identified in Planet9 due to incorrect file permissions assigned to an application executable used by the Planet9 background service. The service runs with SYSTEM privileges, while the affected executable grants excessive permissions to non-administrative users. As a result, an authenticated local user could potentially modify or replace the executable and execute arbitrary code with SYSTEM privileges when the service starts or the system is restarted.

Published Updated Sources: NVD, Acer (CNA), GitHub, GitHub Security Advisory, SOCRadar CTI

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Exploit code

public exploit, none observed

EPSS

0%

ahead of 0% of scored CVEs

Affects

Acer

Planet9 background service

CVSS base

8.5

high

Remediation

The vendor's own words where we have them.

An update is available that resolves this vulnerability by removing the affected executable files and uninstalling the background service (PLANET9DAService). Planet9 will automatically upgrade to the latest version.

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

  • Identify exposed assets running affected vendor/product/version combinations.
  • Prioritize based on EPSS, PoC availability, and external exposure.
  • Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

VendorProductVersionsStatus
AcerPlanet9 background service—Vulnerable

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactSource
8.5CVSS 4.0high——Acer (CNA)

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What this weakness leads to

MITRE's own consequences and mitigations for the weakness class — the authority's wording, not guidance derived from the CVSS vector.

MITRE

CWE-732 · Incorrect Permission Assignment for Critical Resource

  • Read Application Data
  • Read Files or Directories
  • Gain Privileges or Assume Identity
  • Modify Application Data

Mitigation: When using a critical resource such as a configuration file, check to see if the resource has insecure permissions (such as being modifiable by any regular user) [REF-62], and generate an error or even exit the software if there is a possibility that the resource could have been modified by an unauthorized party.

Weakness & attack patterns

  • CWE-732

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

CAPEC-122 · Privilege AbuseCAPEC-61 · Session FixationCAPEC-17 · Using Malicious FilesCAPEC-127 · Directory IndexingCAPEC-642 · Replace BinariesCAPEC-1 · Accessing Functionality Not Properly Constrained by ACLsCAPEC-62 · Cross Site Request ForgeryCAPEC-180 · Exploiting Incorrectly Configured Access Control Security LevelsCAPEC-60 · Reusing Session IDs (aka Session Replay)CAPEC-234 · Hijacking a privileged processCAPEC-206 · Signing Malicious Code
  • T1574.010Hijack Execution Flow: ServicesFile Permissions Weakness
  • T1548Abuse Elevation Control Mechanism
  • T1083File and Directory Discovery

Public exploit

Capability, not use: code existing is a different claim from anyone running it.

Repositories

1

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

  • Monitor for scanner or exploit-pattern traffic after 1 public PoC repositories were reported.
EDR process telemetryhost service logs

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

  1. 2026

  2. Added · CVSS 3.1 8.5

    Aug 17, 2026 · NVD

  3. Initial · CVE published

    Aug 17, 2026 · NVD

  4. Added · GHSA-63xg-4wvg-w9xp published (high)

    Aug 17, 2026 · GitHub Security Advisory

References

3 on the record

Elsewhere on this site

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record1

What should defenders know first?

CVE-2026-50602 is Planet9 Incorrect Permission Assignment Vulnerability Information, a high vulnerability affecting Planet9 background service from Acer. The current evidence does not list it in CISA KEV, and the exploit status is: Active exploitation is not confirmed from current sources for CVE-2026-50602. Public exploit evidence is: 1 public PoC repositories reported; 0 marked weaponized in current dataset. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 8.5 describes technical severity, while EPSS 0% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.