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CVE-2026-11931 AWS CVE debrief

CVE-2026-11931 is a medium-severity vulnerability affecting Kiro IDE on macOS and Linux before version 0.11.133. The vulnerability is caused by incorrect default permissions, which expose the authentication token cache file to other local users or processes. The cache file has world-readable permissions (0644) instead of owner-restricted permissions (0600).

Vendor
AWS
Product
Kiro IDE
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-06-16
Advisory published
2026-06-15
Advisory updated
2026-06-16

Who should care

Users of Kiro IDE on macOS and Linux, especially those operating in multi-user environments, should be aware of this vulnerability.

Technical summary

The vulnerability has a CVSS score of 6.8 and is classified as CWE-276. It allows local users or processes to access the authentication token cache file due to incorrect permissions.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to Kiro IDE version 0.11.133 or later.
  • After upgrading and restarting the application, the cache file permissions are automatically updated on the next token refresh.
  • Users operating in a multi-user environment can invalidate existing tokens by reauthenticating.

Evidence notes

The CVE record and NVD detail can be found at [cve-org] and [nvd], respectively. Additional information is available at [ref-4] and [ref-5].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11931 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11931

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

  • CVE-2026-11931 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11931

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://aws.amazon.com/security/security-bulletins/2026-045-aws/

    ff89ba41-3aa1-4d27-914a-91399e9639e5

  • Source reference

    Unverified legacy reference

    URL: https://kiro.dev/changelog/ide/0-11/

    ff89ba41-3aa1-4d27-914a-91399e9639e5

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.