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PatchSiren cyber security CVE debrief

CVE-2026-48700 LXQt CVE debrief

A critical vulnerability was discovered in PCManFM-Qt, a file manager application, that allows for code execution when a regular file's path is passed as a URI in an org.freedesktop.FileManager1.ShowFolders D-Bus method call. This issue, tracked as CVE-2026-48700, has a CVSS score of 9.3 and is considered critical. The vulnerability exists due to the application's handling of file paths, which could be exploited to achieve code execution or circumvent network namespace restrictions. Users and administrators should be aware of this vulnerability and take necessary precautions to mitigate potential risks.

Vendor
LXQt
Product
PCManFM-Qt
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-22
Original CVE updated
2026-07-23
Advisory published
2026-05-22
Advisory updated
2026-07-23

Who should care

Users and administrators of PCManFM-Qt, particularly those using versions starting from 1.1.0, should be aware of this vulnerability and take necessary precautions to mitigate potential risks. This includes reviewing the vendor's advisory, applying patches or updates, and implementing additional security measures to restrict the application's actions.

Technical summary

The vulnerability exists in the org.freedesktop.FileManager1.ShowFolders D-Bus method, where PCManFM-Qt delegates to a different program based on the file type without user confirmation. This could be exploited to achieve code execution or circumvent network namespace restrictions. The issue affects PCManFM-Qt versions starting from 1.1.0. The CVSS score of 9.3 indicates a critical severity level, highlighting the need for immediate attention and mitigation.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by the vendor as soon as possible
  • Restrict access to the D-Bus method to trusted users and applications
  • Monitor system logs for suspicious activity related to PCManFM-Qt and the FileManager1.ShowFolders method
  • Consider implementing additional security measures, such as SELinux or AppArmor policies, to restrict PCManFM-Qt's actions
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-05-22T19:17:04.623Z and last modified on 2026-07-23T16:10:00.137Z. The NVD entry is currently Deferred. There is limited information available about the specific details of this vulnerability, and further verification is needed to understand the full scope of the issue. Defenders should verify the affected versions of PCManFM-Qt and review the vendor's advisory for guidance on mitigation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48700 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48700

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-48700 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48700

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.