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PatchSiren cyber security CVE debrief

CVE-2026-53861 OpenClaw CVE debrief

CVE-2026-53861 is a MEDIUM severity vulnerability in OpenClaw before version 2026.5.6. The vulnerability is caused by an allowlist bypass in the macOS Swift exec feature, which misses combined POSIX inline-command flags. This allows attackers to execute shell content outside the intended allowlist check by using combined flag forms, potentially allowing unauthorized command execution depending on operator configuration. The vulnerability has a CVSS score of 5.3 and was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-53861).

Vendor
OpenClaw
Product
Unknown
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-18
Advisory published
2026-06-16
Advisory updated
2026-06-18

Who should care

Users of OpenClaw before version 2026.5.6, especially those using the macOS Swift exec feature, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by an allowlist bypass in the macOS Swift exec feature, which misses combined POSIX inline-command flags.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update OpenClaw to version 2026.5.6 or later.
  • Review and restrict the use of combined POSIX inline-command flags in the macOS Swift exec feature.
  • Monitor for suspicious activity and implement additional security measures as needed.

Evidence notes

The vulnerability was reported by Vulncheck and is tracked under [ref-4](https://github.com/openclaw/openclaw/security/advisories/GHSA-c226-q6fx-6j6c) and [ref-5](https://www.vulncheck.com/advisories/openclaw-allowlist-bypass-via-combined-posix-inline-flags-on-macos).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53861 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53861

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

  • CVE-2026-53861 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53861

    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.