CVE-2023-35928 — Nextcloud Server is a space for data storage on Nextcloud, a self-hosted product

Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.1

01What is this vulnerability?

Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until…

02Affected products

Vendor	Product	Versions
nextcloud	security	advisories — Nextcloud Enterprise Server >= 19.0.0, < 19.0.13.9, Nextcloud Enterprise Server >= 20.0.0.0, < 20.0.14.14, Nextcloud Enterprise Server >= 21.0.0.0, < 21.0.9.12, Nextcloud Enterprise Server >= 22.0.0.0, < 22.2.10.12, Nextcloud Enterprise Server >= 23.0.0.0, < 23.0.12.7, Nextcloud Enterprise Server >= 24.0.0.0, < 24.0.12.2, Nextcloud Enterprise Server >= 25.0.0, < 25.0.7 , Nextcloud Enterprise Server >= 26.0.0, < 26.0.2, Nextcloud Server >= 25.0.0, < 25.0.7, Nextcloud Server >= 26.0.0, < 26.0.2

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-06-23T20:58:33.225Z
• Last modified: 2024-12-05T16:18:09.131Z

09References

• github.com — https://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-x…
• github.com — https://github.com/nextcloud/server/pull/38265
• hackerone.com — https://hackerone.com/reports/1978882