CVE-2023-39962

highpriority · track · 31EPSS 0.010 · 63 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.02% (63rd) EPSS

CVSS 7.7 · high

Is it mine?

28 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 19.0.0 and prior to versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a malicious user could delete any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. As a workaround, disable app files_external. This also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.

cvss

Technical severity, 0–10. One row per scoring source.

7.7

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.7highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.1 · impact 4

v3.17.7highAV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.7highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.7highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · security-advisories@github.comexploitability 3.1 · impact 4

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284USCWE-284US

affected products (28)

Products and version ranges known to be affected.

nextcloud security-advisories19.0.0, → 19.0.13.10enisa_euvdEU
nextcloud security-advisories20.0.0, → 20.0.14.15enisa_euvdEU
nextcloud security-advisories21.0.0, → 21.0.9.13enisa_euvdEU
nextcloud security-advisories22.0.0, → 22.2.10.14enisa_euvdEU
nextcloud security-advisories23.0.0, → 23.0.12.9enisa_euvdEU
nextcloud security-advisories24.0.0, → 24.0.12.5enisa_euvdEU
nextcloud security-advisories25.0.0, → 25.0.9enisa_euvdEU
nextcloud security-advisories26.0.0, → 26.0.4enisa_euvdEU
nextcloud security-advisories27.0.0, → 27.0.1enisa_euvdEU
Nextcloud GmbH Nextcloud Server≤ 27.0.0fstec_bduRU
Nextcloud GmbH Nextcloud Server19.0.0 → 19.0.13.10fstec_bduRU
Nextcloud GmbH Nextcloud Server20.0.0 → 20.0.14.15fstec_bduRU
Nextcloud GmbH Nextcloud Server21.0.0 → 21.0.9.13fstec_bduRU
Nextcloud GmbH Nextcloud Server22.0.0 → 22.2.10.14fstec_bduRU
Nextcloud GmbH Nextcloud Server23.0.0 → 23.0.12.9fstec_bduRU
Nextcloud GmbH Nextcloud Server24.0.0 → 24.0.12.5fstec_bduRU
Nextcloud GmbH Nextcloud Server25.0.0 → 25.0.9fstec_bduRU
Nextcloud GmbH Nextcloud Server26.0.0 → 26.0.4fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
nextcloud nextcloud server19.0.0 → 19.0.13.10nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*

showing 20 of 28

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-2032Nextcloud: Mehrere SchwachstellenDeutsch2023-08-09csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Nextcloud ausnutzen, um einen Denial of Service zu verursachen, Sicherheitsvorkehrungen zu umgehen und Informationen offenzulegen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd cert_bund NVD CVE.org MITRE

published 2023-08-10modified 2026-06-17

references (10)

External citations — patches, advisories, analysis.

scry

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