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CVE-2024-52510

HighPublished

Nextcloud Desktop client behaves incorrectly if the initial end-to-end-encryption signature is empty

Published: Nov 15, 2024
Updated: Nov 15, 2024
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 52.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with your computer. The Desktop client did not stop with an error but allowed by-passing the signature validation, if a manipulated server sends an empty initial signature. It is recommended that the Nextcloud Desktop client is upgraded to 3.14.2 or later.

Sources

CVE-2024-52510PoC
Proof-of-concept exploit for CVE-2024-52510 demonstrating signature bypass in Nextcloud's E2EEv2 protocol, enabling server-side decryption of encrypted files via metadata key injection.

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