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CVE-2026-45267

Nextcloud: Missing permission check for from submissions

Published: Jun 1, 2026Updated: Jun 1, 2026 Sources: CVE List NVD
NVD MITRE
6.5CVSS
MEDIUM

Nextcloud is an open source content collaboration platform. Prior to version 5.2.6, a missing permissions check allowed users to request reading form submissions of other users. This issue has been patched in version 5.2.6.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None

Weaknesses

CWE-200CWE-862

Affected Products

security-advisories
nextcloud

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

3 techniques
Collection
Initial Access
View detailed technique mapping

References

https://github.com/nextcloud/forms/pull/3269
github.com
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r4gh-f8x6-m55f
github.com
https://hackerone.com/reports/3628817
hackerone.com

Timeline

Published
Jun 1, 2026
Last Updated
Jun 1, 2026

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