What’s Vulnerable › Vulnerabilities

CVE-2024-37887: Nextcloud Server's events information leaked with shared calendars on recurrence exceptions

• Severity: low (CVSS 3.5 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: 2024-06-14 · updated 2026-06-17
• Weakness: CWE-284

Description

Nextcloud Server is a self hosted personal cloud system. Private shared calendar events' recurrence exceptions can be read by sharees. It is recommended that the Nextcloud Server is upgraded to 27.1.10 or 28.0.6 or 29.0.1 and that the Nextcloud Enterprise Server is upgraded to 27.1.10 or 28.0.6 or 29.0.1.

Affected products

• Nextcloud Server: from 27.0.0 before 27.1.10; from 28.0.0 through 28.0.6; from 28.0.0 before 28.0.6; 29.0.0 — fixed in 27.1.10, 28.0.6

How to fix

Upgrade to a fixed version: Nextcloud Server 27.1.10, 28.0.6. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h4xv-cjpm-j595
• https://github.com/nextcloud/server/pull/45309
• https://hackerone.com/reports/2479325
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h4xv-cjpm-j595
• https://github.com/nextcloud/server/pull/45309
• https://hackerone.com/reports/2479325

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