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PatchSiren cyber security CVE debrief

CVE-2026-108721 iFurySt CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-11T12:19:31.981Z and has not been modified since then. Open Computer Use through 1.0.0 on macOS contains an improper case sensitivity handling vulnerability that allows local MCP callers to bypass the password-manager denylist using case-variant bundle identifiers. This vulnerability affects macOS system administrators and security teams who should assess exposure and prioritize remediation for Open Computer Use 1.0.0 installations. The vulnerability's existence is confirmed by official sources, including the CVE Program and NVD.

Vendor
iFurySt
Product
open-computer-use
CVSS
MEDIUM 5.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-11
Original CVE updated
2026-10-11
Advisory published
2026-10-11
Advisory updated
2026-10-11

Who should care

macOS system administrators and security teams should assess exposure and prioritize remediation for Open Computer Use 1.0.0 installations. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Additionally, they should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

Defenders should prioritize verifying and remediating Open Computer Use 1.0.0 installations to prevent local attackers from bypassing the password-manager denylist.

  • Local attackers may bypass password manager denylist
  • Read accessibility trees and capture screenshots
  • Drive unlocked password manager interfaces

Technical summary

Open Computer Use through 1.0.0 on macOS contains an improper case sensitivity handling vulnerability that allows local MCP callers to bypass the password-manager denylist using case-variant bundle identifiers. This vulnerability affects local attackers who can pass identifiers like com.1Password.1Password to get_app_state and action tools to read accessibility trees, capture screenshots, and drive unlocked password manager interfaces. The vulnerability is confirmed by official sources, including the CVE Program and NVD.

Defensive priority

macOS defenders should prioritize verifying and remediating Open Computer Use 1.0.0 installations.

Recommended defensive actions

  • Verify Open Computer Use version and apply updates if available
  • Restrict access to sensitive password manager interfaces
  • Monitor for suspicious activity related to accessibility trees and screenshots
  • 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
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability in Open Computer Use through 1.0.0. Official sources, including the CVE Program and NVD, confirm the vulnerability's existence. The vulnerability allows local MCP callers to bypass the password-manager denylist using case-variant bundle identifiers. The source item and CVE record provide additional information on the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-108721 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-108721

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

  • CVE-2026-108721 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-108721

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

Supplemental references

  • Open Computer Use through 1.0.0 Denylist Bypass via Case-Variant Bundle ID

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/108xxx/CVE-2026-108721.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://hackmd.io/@haind/rJHI_S6IiMl

    Supplemental source - third-party-advisory

  • Source reference

    Unverified legacy reference

    URL: https://github.com/iFurySt/open-codex-computer-use/blob/8a3a7dec06402db2d760368cb24676ad3ba42c49/packages/OpenComputerUseKit/Sources/OpenComputerUseKit/AppDiscovery.swift

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://github.com/iFurySt/open-codex-computer-use

    Supplemental source - product

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/open-computer-use-through-1.0.0-denylist-bypass-via-case-variant-bundle-id

    Supplemental source - third-party-advisory

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.