CVE-2026-45154: Nextcloud: Improper Access Control in Collectives

Severity: low (CVSS 2.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-01 · updated 2026-07-22
Weakness: CWE-284

Description

Nextcloud is an open source content collaboration platform. From version 2.6.0 to before version 4.3.0, when a previous collective pages was deleted and the collective was shared view-only, guests with access to the collective were able to access the deleted pages directly from the trashbin. This issue has been patched in version 4.3.0.

Affected products

nextcloud security-advisories: from 2.6.0, < 4.3.0

References

https://github.com/nextcloud/collectives/pull/2432
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8mpv-ggq8-hf3w
https://hackerone.com/reports/3521434

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