Read the docs
TI-2024-17235 Aliases CVE-2024-26145

Uninvited user is able to join and mark the attendance of the the private event

Priority LOW 31CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

Discourse Calendar adds the ability to create a dynamic calendar in the first post of a topic on Discourse. Uninvited users are able to gain access to private events by crafting a request to update their attendance. This problem is resolved in commit dfc4fa15f340189f177a1d1ab2cc94ffed3c1190. As a workaround, one may use post visibility to limit access.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00393 33rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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-calendar>= 2201b254, < dfc4fa15f340189f177a1d1ab2cc94ffed3c1190—No fix listedCNA
  • discourse-calendar Vendordiscourse Affected >= 2201b254, < dfc4fa15f340189f177a1d1ab2cc94ffed3c1190 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:discourse:calendar:*:*:*:*:*:*:*:*before 2024-02-21Vulnerablediscourse
  • cpe:2.3:a:discourse:calendar:*:*:*:*:*:*:*:* Versions before 2024-02-21 Vulnerable ·discourse

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-26145

References

Patch 1

Advisory 1

  • 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
  • TI-2024-16334 User can see invitees in events created in PMs and private categories CVSS 3.1MEDIUM 5.3

Sources

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