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TI-2024-16334 Aliases CVE-2024-24817

User can see invitees in events created in PMs and private categories

Priority LOW 24CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00419 36th percentileScored 2026-11-07
Fix Fixed discourse-calendar (discourse): 0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
discoursediscourse-calendarbefore 0.40.4Patch availableCNA
  • discourse-calendar Vendordiscourse Affected before 0.4 Fixed in 0.4 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:discourse:calendar:*:*:*:*:*:*:*:*before 0.4Vulnerablediscourse
  • cpe:2.3:a:discourse:calendar:*:*:*:*:*:*:*:* Versions before 0.4 Vulnerable ·discourse

Remediation

  • Fix · CNA discourse-calendar (discourse) Fixed in 0.4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-24817

References

Patch 1

Advisory 1

  • TI-2024-17235 Uninvited user is able to join and mark the attendance of the the private event CVSS 3.1MEDIUM 6.5
  • TI-2024-30374 Discourse Calendar plugin event names susceptible to XSS CVSS 3.1MEDIUM 6.1
  • TI-2022-20254 Discourse-calendar exposes members of hidden groups CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences