What’s Vulnerable › Vulnerabilities

CVE-2022-41968: Nextcloud Server's calendar name length not validated before writing to database

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-01 · updated 2026-06-17
• Weakness: CWE-400

Description

Nextcloud Server is an open source personal cloud server. Prior to versions 23.0.10 and 24.0.5, calendar name lengths are not validated before writing to a database. As a result, an attacker can send unnecessary amounts of data against the database. Version 23.0.10 and 24.0.5 contain patches for the issue. No known workarounds are available.

Affected products

• Nextcloud Server: from 23.0.0 before 23.0.10; from 24.0.0 before 24.0.5 — fixed in 23.0.10, 24.0.5

How to fix

Upgrade to a fixed version: Nextcloud Server 23.0.10, 24.0.5. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m92j-xxc8-hq3v
• https://github.com/nextcloud/server/pull/33139
• https://hackerone.com/reports/1596148
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m92j-xxc8-hq3v
• https://github.com/nextcloud/server/pull/33139
• https://hackerone.com/reports/1596148

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