CVE-2025-66510

mediumpriority · track · 20EPSS 0.004 · 29 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.36% (29th) EPSS

CVSS 4.9 · medium

Is it mine?

25 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server prior to 31.0.10 and 32.0.1 and Nextcloud Enterprise Server prior to 28.0.14.11, 29.0.16.8, 30.0.17.3, and 31.0.10, contacts search allowed to retrieve personal data of other users (emails, names, identifiers) without proper access control. This allows an authenticated user to retrieve information about accounts that are not related or added as contacts.

cvss

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

4.9

010

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

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 1.2 · impact 3.6

v3.14.9mediumAV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.14.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.14.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:Nsecondary · security-advisories@github.comexploitability 0.9 · impact 3.6

v3.14.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-359USCWE-359US

affected products (25)

Products and version ranges known to be affected.

Nextcloud Nextcloud Approvalall versionscert_bundDEcpe:/a:nextcloud:nextcloud:approval
Nextcloud Nextcloud Calendarall versionscert_bundDEcpe:/a:nextcloud:nextcloud:calendar
Nextcloud Nextcloud Deckall versionscert_bundDEcpe:/a:nextcloud:nextcloud:deck
Nextcloud Nextcloud Desktopall versionscert_bundDEcpe:/a:nextcloud:nextcloud:desktop
Nextcloud Nextcloud Enterprise Serverall versionscert_bundDEcpe:/a:nextcloud:nextcloud:enterprise_server
Nextcloud Nextcloud Groupfoldersall versionscert_bundDEcpe:/a:nextcloud:nextcloud:groupfolders
Nextcloud Nextcloud Mailall versionscert_bundDEcpe:/a:nextcloud:nextcloud:mail
Nextcloud Nextcloud Serverall versionscert_bundDEcpe:/a:nextcloud:nextcloud:server
Nextcloud Nextcloud Tablesall versionscert_bundDEcpe:/a:nextcloud:nextcloud:tables
nextcloud security-advisories≤ < 31.0.10enisa_euvdEU
nextcloud security-advisories32.0.0beta1, → 32.0.1enisa_euvdEU
Nextcloud GmbH Nextcloud Enterprise Server≤ 31.0.10fstec_bduRU
Nextcloud GmbH Nextcloud Enterprise Server≤ 30.0.17.3fstec_bduRU
Nextcloud GmbH Nextcloud Enterprise Server≤ 29.0.16.8fstec_bduRU
Nextcloud GmbH Nextcloud Enterprise Server≤ 28.0.14.11fstec_bduRU
Nextcloud GmbH Nextcloud Server≤ 32.0.1fstec_bduRU
Nextcloud GmbH Nextcloud Server≤ 31.0.10fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 8.0fstec_bduRU
nextcloud nextcloud server28.0.0 → 28.0.14.11nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
nextcloud nextcloud server29.0.0 → 29.0.16.8nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*

showing 20 of 25

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2752Nextcloud: Mehrere SchwachstellenDeutsch2025-12-04csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Nextcloud ausnutzen, um Dateien zu manipulieren, um Informationen offenzulegen, um einen Cross-Site Scripting Angriff durchzuführen, um Sicherheitsvorkehrungen zu umgehen, und um falsche Informationen darzustellen.
BIT-nextcloud-2025-66510Nextcloud Server Contacts Search allowed users to retrieve contact information of other users beyond their contact list2026-07-13vendor · osvUS
Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server prior to 31.0.10 and 32.0.1 and Nextcloud Enterprise Server prior to 28.0.14.11, 29.0.16.8, 30.0.17.3, and 31.0.10, contacts search allowed to retrieve personal data of other users (emails, names, identifiers) without proper access control. This allows an authenticated user to retrieve information about accounts that are not related or added as contacts.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv cert_bund nvd NVD CVE.org MITRE

published 2025-12-05modified 2026-10-18

references (10)

External citations — patches, advisories, analysis.

scry

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