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CVE-2026-45264— Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames

Quick assessment

Affected
nextcloud security-advisories
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Team folders是Nextcloud开源的一个文件共享软件。 Team folders 17.0.0版本至17.0.15之前版本、18.0.0版本至18.1.12之前版本、19.0.0版本至19.1.16之前版本、20.0.0版本至20.1.11之前版本和21.0.0版本至21.0.4之前版本存在访问控制错误漏洞，该漏洞源于权限检查缺失，可能导致具有读取和创建权限但无更新权限的用户重命名团队文件夹中的文件。

CVSS 4.3 · Medium EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 5

VendorProduct Version RangeStatus
nextcloud security-advisories >= 17.0.0, < 17.0.15 affected
>= 18.0.0, < 18.1.12 affected
>= 19.0.0, < 19.1.16 affected
>= 20.0.0, < 20.1.11 affected
>= 21.0.0, < 21.0.4 affected
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I. Basic Information for CVE-2026-45264

Vulnerability Information
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Vulnerability Title
Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can rename files in the team folder. This issue has been patched in versions 17.0.15, 18.1.12, 19.1.16, 20.1.11, and 21.0.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Team folders 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Team folders是Nextcloud开源的一个文件共享软件。 Team folders 17.0.0版本至17.0.15之前版本、18.0.0版本至18.1.12之前版本、19.0.0版本至19.1.16之前版本、20.0.0版本至20.1.11之前版本和21.0.0版本至21.0.4之前版本存在访问控制错误漏洞，该漏洞源于权限检查缺失，可能导致具有读取和创建权限但无更新权限的用户重命名团队文件夹中的文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nextcloud security-advisories >= 17.0.0, < 17.0.15 -

II. Public POCs for CVE-2026-45264

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III. Intelligence Information for CVE-2026-45264

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Patches & Fixes for CVE-2026-45264 (1)

Vendor Advisories for CVE-2026-45264 (1)

Same Patch Batch · nextcloud · 2026-06-01 · 26 CVEs total

CVE-2026-45545 8.2 HIGH Nextcloud: SQL Injection in Column Type Parameter Allows Arbitrary SQL Execution
CVE-2026-45156 8.1 HIGH Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification
CVE-2026-45281 8.1 HIGH Nextcloud: Cross-Account Calendar Takeover via Unauthorized Group-Member-Set Update
CVE-2026-45722 7.1 HIGH Nextcloud: Tables app allows limited SQLi in ORDER BY with malicious sort order argument f
CVE-2026-45810 6.8 MEDIUM Nextcloud: Propfind requests for file comments allowed to load comments for other files
CVE-2026-45275 6.5 MEDIUM Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with
CVE-2026-45267 6.5 MEDIUM Nextcloud: Missing permission check for from submissions
CVE-2026-45282 6.5 MEDIUM Nextcloud: Logged-in user bypasses share password and download restrictions on Text attach
CVE-2026-45285 6.4 MEDIUM Nextcloud: Hidden Public Link creation when sharing to a Team External Member
CVE-2026-45157 6.3 MEDIUM Nextcloud: Valid share tokens allow to access tempory upload files of share owner
CVE-2026-45283 6.3 MEDIUM Nextcloud: Files Lock app allows users to lock and unlock files of other users
CVE-2026-45690 5.9 MEDIUM Nextcloud: Two-Factor Authentication Bypass via Pending Session Token Replay
CVE-2026-45691 5.9 MEDIUM Nextcloud: Bypass of second factor authentication on DAV endpoints
CVE-2026-45543 5.3 MEDIUM Nextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible t
CVE-2026-45284 4.6 MEDIUM Nextcloud: Wrong condition in the User OIDC app's LdapService allowed deleted LDAP users t
CVE-2026-45153 4.6 MEDIUM Nextcloud: PIN bypass in PassCodeActivity via back button
CVE-2026-45279 4.4 MEDIUM Nextcloud: Limited path traversal via template API if using `{lang}` in config
CVE-2026-45544 4.3 MEDIUM Nextcloud: Information Disclosure of view filter metdata via Broken Sensitive Data Masking
CVE-2026-45286 4.3 MEDIUM Nextcloud: Calendar app leaked user identifiers via attendee suggestion endpoint
CVE-2026-45159 3.5 LOW Nextcloud: Files drop share links for end-to-end encrypted folders allowed to drop files i

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-284

V. Comments for CVE-2026-45264

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