What’s Vulnerable › Vulnerabilities

CVE-2023-29000: Nextcloud Desktop client does not verify received singed certificate in end-to-end encryption

• Severity: medium (CVSS 6.5 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: 2023-04-04 · updated 2026-06-17
• Weakness: CWE-295

Description

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.7.0, by trusting that the server will return a certificate that belongs to the keypair of the user, a malicious server could get the desktop client to encrypt files with a key known to the attacker. This issue is fixed in Nextcloud Desktop 3.7.0. No known workarounds are available.

Affected products

• Desktop Client: from 3.0.0 before 3.7.0 — fixed in 3.7.0

How to fix

Upgrade to a fixed version: Desktop Client 3.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/desktop/pull/4949
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h82x-98q3-7534
• https://hackerone.com/reports/1679267
• https://github.com/nextcloud/desktop/pull/4949
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h82x-98q3-7534
• https://hackerone.com/reports/1679267

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