CVE catalog

CVE-2026-45281

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, with the knowledge of other users’ principal URL an

[CVE catalog]

Severity
High · CVSS 8.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
Source
[NVD] · [CVE record]
EPSS
0.28% · Oct 25, 2026

A flaw was found in Nextcloud Server. An authenticated user, with knowledge of another user's principal URL, could exploit improper authorization controls to gain full access to that user's calendar. This allows the attacker to view and modify the victim's calendar, leading to unauthorized information disclosure and data manipulation. Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Cpenextcloud_serverNot reported32.0.9fixed
Cpenextcloud_serverNot reported33.0.3fixed
Cpenextcloud_serverNot reported21.0.9.23fixed
Cpenextcloud_serverNot reported22.2.10.39fixed
Cpenextcloud_serverNot reported23.0.12.35fixed
Cpenextcloud_serverNot reported24.0.12.34fixed
Cpenextcloud_serverNot reported25.0.13.29fixed
Cpenextcloud_serverNot reported26.0.13.26fixed
Cpenextcloud_serverNot reported27.1.11.26fixed
Cpenextcloud_serverNot reported28.0.14.17fixed
Cpenextcloud_serverNot reported29.0.16.16fixed
Cpenextcloud_serverNot reported30.0.17.9fixed
Cpenextcloud_serverNot reported31.0.14.5fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Cpenextcloud_servercpeNot reported32.0.9Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported33.0.3Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported21.0.9.23Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported22.2.10.39Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported23.0.12.35Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported24.0.12.34Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported25.0.13.29Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported26.0.13.26Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported27.1.11.26Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported28.0.14.17Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported29.0.16.16Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported30.0.17.9Not reportedNot reportedNot reported
Cpenextcloud_servercpeNot reported31.0.14.5Not reportedNot reportedNot reported

OpenFactory catalog packages

No matching packages in this catalog.

Observed:

References

[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX]