What’s Vulnerable › Vulnerabilities

CVE-2024-37882: Nextcloud Server can reshare read&share only folder with more permissions

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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. A recipient of a share with read&share permissions could reshare the item with more permissions. It is recommended that the Nextcloud Server is upgraded to 26.0.13 or 27.1.8 or 28.0.4 and that the Nextcloud Enterprise Server is upgraded to 26.0.13 or 27.1.8 or 28.0.4.

Affected products

• Nextcloud Server: from 26.0.0 before 26.0.13; from 27.0.0 before 27.1.8; from 28.0.0 before 28.0.4; from 23.0.0 before 23.0.12.17; from 24.0.0 before 24.0.12.13; from 25.0.0 before 25.0.13.8 — fixed in 23.0.12.17, 24.0.12.13, 25.0.13.8, 26.0.13, 27.1.8, 28.0.4

How to fix

Upgrade to a fixed version: Nextcloud Server 23.0.12.17, 24.0.12.13, 25.0.13.8, 26.0.13. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jjm3-j9xh-5xmq
• https://github.com/nextcloud/server/pull/44339
• https://hackerone.com/reports/2289425
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jjm3-j9xh-5xmq
• https://github.com/nextcloud/server/pull/44339
• https://hackerone.com/reports/2289425

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