CVE-2026-45286

mediumpriority · track · 0EPSS 0.003 · 20 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.28% (20th) EPSS

CVSS 4.3 · medium

Is it mine?

48 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-27

Nextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user can enumerate users on the same Nextcloud instance by using the Calendar app's endpoint for suggesting attendees. The sharing restrictions, applied to other endpoints, were not effective here. This issue has been patched in versions 5.5.17 and 6.2.3.

cvss

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

4.3

010

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

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 1.4

v3.14mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-200US

affected products (48)

Products and version ranges known to be affected.

Nextcloud Nextcloud Android Files <33.1.0all versionscert_bundDE
Nextcloud Nextcloud Approval <2.7.2all versionscert_bundDE
Nextcloud Nextcloud Calendar <5.5.17all versionscert_bundDE
Nextcloud Nextcloud Calendar <6.2.3all versionscert_bundDE
Nextcloud Nextcloud Collectives <4.3.0all versionscert_bundDE
Nextcloud Nextcloud End-to-End Encryption <1.15.4all versionscert_bundDE
Nextcloud Nextcloud End-to-End Encryption <1.16.3all versionscert_bundDE
Nextcloud Nextcloud End-to-End Encryption <1.17.1all versionscert_bundDE
Nextcloud Nextcloud End-to-End Encryption <1.18.1all versionscert_bundDE
Nextcloud Nextcloud End-to-End Encryption <2.0.0-rc.7all versionscert_bundDE
Nextcloud Nextcloud Forms <5.2.6all versionscert_bundDE
Nextcloud Nextcloud Server <32.0.9all versionscert_bundDE
Nextcloud Nextcloud Server <33.0.3all versionscert_bundDE
Nextcloud Nextcloud Talk <21.1.10all versionscert_bundDE
Nextcloud Nextcloud Talk <22.0.11all versionscert_bundDE
Nextcloud Nextcloud Talk <23.0.3all versionscert_bundDE
Nextcloud Nextcloud Team Folders <17.0.15all versionscert_bundDE
Nextcloud Nextcloud Team Folders <18.1.12all versionscert_bundDE
Nextcloud Nextcloud Team Folders <19.1.16all versionscert_bundDE
Nextcloud Nextcloud Team Folders <20.1.11all versionscert_bundDE

showing 20 of 48

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1471Nextcloud: Mehrere SchwachstellenDeutsch2026-05-11csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen im Nextcloud Server und verschiedenen Apps ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um Informationen offenzulegen, und um Dateien zu manipulieren.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund NVD CVE.org MITRE

published 2026-06-01modified 2026-07-22

references (13)

External citations — patches, advisories, analysis.

scry

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