CVE-2023-39963

highpriority · track · 31EPSS 0.003 · 19 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.27% (19th) EPSS

CVSS 7.8 · high

Is it mine?

25 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 20.0.0 and prior to versions 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 missing password confirmation allowed an attacker, after successfully stealing a session from a logged in user, to create app passwords for the victim. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 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. No known workarounds are available.

cvss

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

8.1

010

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

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.17.8highAV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:Lsecondary · ENISA EU

v3.18.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:Lsecondary · security-advisories@github.comexploitability 1.5 · impact 6

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

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284USCWE-284US

affected products (25)

Products and version ranges known to be affected.

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 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 server20.0.0 → 20.0.14.15nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
nextcloud nextcloud server21.0.0 → 21.0.9.13nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
nextcloud nextcloud server22.0.0 → 22.2.10.14nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*

showing 20 of 25

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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