Low severity · published Jun 1, 2026
CVE-2026-45154
Nextcloud: Improper Access Control in Collectives
2.6
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
>= 2.6.0, < 4.3.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45154
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45154
github.com
https://github.com/nextcloud/collectives/pull/2432
github.com
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8mpv-ggq8-hf3w
hackerone.com
https://hackerone.com/reports/3521434
More from security-advisories
9.8
CVE-2022-31132
Unauthenticated SSRF in 3rd party module "cerdic/csstidy"
8.8
CVE-2026-45284
Nextcloud: Wrong condition in the User OIDC app's LdapService allowed deleted LDAP users to authenticate
8.2
CVE-2026-45545
Nextcloud: SQL Injection in Column Type Parameter Allows Arbitrary SQL Execution
8.1
CVE-2026-45281
Nextcloud: Cross-Account Calendar Takeover via Unauthorized Group-Member-Set Update
8.1
CVE-2026-45156
Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification in User OIDC