What’s Vulnerable › Vulnerabilities

CVE-2022-29243: Improper input-size validation on the user new session name in Nextcloud Server

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-31 · updated 2026-06-17
• Weakness: CWE-20

Description

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform. Prior to versions 22.2.7 and 23.0.4, missing input-size validation of new session names allows users to create app passwords with long names. These long names are then loaded into memory on usage, resulting in impacted performance. Versions 22.2.7 and 23.0.4 contain a fix for this issue. There are currently no known workarounds available.

Affected products

• Nextcloud Server: before 22.2.7; from 23.0.0 (excl.) before 23.0.4 — fixed in 22.2.7, 23.0.4

How to fix

Upgrade to a fixed version: Nextcloud Server 22.2.7, 23.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7cwm-qph5-4h5w
• https://github.com/nextcloud/server/pull/31658
• https://hackerone.com/reports/1153138
• https://security.gentoo.org/glsa/202208-17
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7cwm-qph5-4h5w
• https://github.com/nextcloud/server/pull/31658
• https://hackerone.com/reports/1153138
• https://security.gentoo.org/glsa/202208-17

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