What’s Vulnerable › Vulnerabilities

CVE-2024-26145: Uninvited user is able to join and mark the attendance of the the private event

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-21 · updated 2026-06-17
• Weakness: CWE-863

Description

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.

Affected products

• discourse-calendar: before 2024-02-21 — fixed in 2024-02-21

How to fix

Upgrade to a fixed version: discourse-calendar 2024-02-21. Check the vendor advisory for mitigations.

References

• https://github.com/discourse/discourse-calendar/commit/dfc4fa15f340189f177a1d1ab2cc94ffed3c1190
• https://github.com/discourse/discourse-calendar/security/advisories/GHSA-4hh7-6m34-p2jp
• https://github.com/discourse/discourse-calendar/commit/dfc4fa15f340189f177a1d1ab2cc94ffed3c1190
• https://github.com/discourse/discourse-calendar/security/advisories/GHSA-4hh7-6m34-p2jp

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