CVE-2023-28998: nextcloud desktop Missing Cryptographic Step
Vulnerability summary
CVE-2023-28998 is a medium (CVSS 6.7) Missing Cryptographic Step vulnerability in nextcloud desktop. EPSS estimates a 0.68% chance of exploitation in the next 30 days, higher than 51.5% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 04-04-2023PublishedVulnerability first disclosed.
- 11-02-2025Last modifiedVulnerability information updated.
Description
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure, and add new files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:NDiffers
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:NDiffers
- NVDNIST6.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:NDiffers
EPSS trend
Probability
0.68%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
0.00 pp
From 0.68% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (ethz.ch)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Nextcloud2 products
- desktop≥ 3.0.0, < 3.6.5
- security-advisories≥ 3.0.0, < 3.6.5
Debian1 product
- nextcloud-desktop< 3.7.0-1
Ubuntu1 product
- nextcloud-desktopAll versions (No fix recorded)
3 vendors · 4 products
References
6 links- github.com/nextcloud/security-advisories/security/advisories/GHSA-jh3g-wpwv-cqgrX Refsource CONFIRMREPORTVendor Advisory
