Nextcloud: Files drop share links for end-to-end encrypted folders allowed to drop files into other folders of the share owner

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Summary

CVECVE-2026-45159
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-01 17:17:09 UTC
Updated2026-06-01 18:14:29 UTC
DescriptionNextcloud is an open source content collaboration platform. From versions 1.15.0 to before 1.15.4, 1.16.0 to before 1.16.3, 1.17.0 to before 1.17.1, and 1.18.0 to before 1.18.1, a malicious user with access to an end-to-end encrypted files drop link was able to also drop files into other end-to-end encrypted folders of the share owner. Reading and modifying of other files was not possible. This issue has been patched in versions 1.15.4, 1.16.3, 1.17.1, 1.18.1, and 2.0.0-rc.7.

Risk And Classification

Primary CVSS: v3.1 3.5 LOW from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

EPSS: 0.000250000 probability, percentile 0.074130000 (date 2026-06-03)

Problem Types: CWE-639 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.5LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.1CNADECLARED3.5LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nextcloud Security-advisories affected >= 1.15.0, < 1.15.4 Not specified
CNA Nextcloud Security-advisories affected >= 1.16.0, < 1.16.3 Not specified
CNA Nextcloud Security-advisories affected >= 1.17.0, < 1.17.1 Not specified
CNA Nextcloud Security-advisories affected >= 1.18.0, < 1.18.1 Not specified

References

ReferenceSourceLinkTags
github.com/nextcloud/end_to_end_encryption/pull/1395 [email protected] github.com
github.com/nextcloud/security-advisories/security/advisories/GHSA-p3qw-7... [email protected] github.com
hackerone.com/reports/3304830 [email protected] hackerone.com
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