CVE-2023-48239

highpriority · track · 28EPSS 0.009 · 61 %ileDEEURUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.95% (61st) EPSS
CVSS 7.1 · 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 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and starting in version 20.0.0 and prior to versions 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Enterprise Server, a malicious user could update any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud Server 25.0.13, 26.0.8, and 27.1.3 and Nextcloud Enterprise Server is upgraded to 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 contain a patch for this issue. As a workaround, disable app files_external. This workaround also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.

01

cvss

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

8.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–8.5

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 4.2
v3.17.1highAV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Hsecondary · FSTEC (BDU) RU
v3.18.5highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:Hsecondary · ENISA EU
v3.18.5highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:Hsecondary · security-advisories@github.comexploitability 3.1 · impact 4.7
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

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

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284USCWE-284US
04

affected products (25)

Products and version ranges known to be affected.

showing 20 of 25
05

advisories (1)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2023-2973Nextcloud: Mehrere SchwachstellenDeutsch2023-11-20csaf · cert_bundDE

    Ein entfernter, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in Nextcloud ausnutzen, um einen Denial of Service Angriff durchzuführen, um einen Denial of Service Zustand herbeizuführen, Informationen offenzulegen, Dateien zu manipulieren, einen Cross-Site-Scripting-Angriff durchzuführen oder Sicherheitsvorkehrungen zu umgehen.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bdunvdcert_bundNVDCVE.orgMITRE
published 2023-11-21modified 2026-06-17
08

references (10)

External citations — patches, advisories, analysis.

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