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CVE-2026-45282— Nextcloud: Logged-in user bypasses share password and download restrictions on Text attachments via documentId leads to unauthorized file access

CVSS 6.5 · Medium EPSS 0.29% · P22

Affected Version Matrix 2

VendorProductVersion RangeStatus
nextcloudsecurity-advisories>= 32.0.0, < 32.0.9affected
>= 33.0.0, < 33.0.3affected
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I. Basic Information for CVE-2026-45282

Vulnerability Information
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Vulnerability Title
Nextcloud: Logged-in user bypasses share password and download restrictions on Text attachments via documentId leads to unauthorized file access
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authenticated attacker can access attachments of link shares when knowing the share token, circumventing password protection or download restrictions. It is applicable to any file that is shared directly, as the attacker only needs to know a documentId they own, apart of the mentioned share token. For shared folders the attacker has to know or guess a documentId of a file that is included inside the folder, making it much harder to exploit. The attacker can only extract an attachments, but not the file shared file or folder itself. It is recommended that the Nextcloud Server is upgraded to 33.0.3 or 32.0.9. It is recommended that the Nextcloud Enterprise Server is upgraded to 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9, 29.0.16.16, 28.0.14.17 or 27.1.11.5
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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
Nextcloud 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud 32.0.0版本至32.0.9之前版本和33.0.0版本至33.0.3之前版本存在访问控制错误漏洞，该漏洞源于链接共享附件访问控制不当，可能导致已认证攻击者在知道共享令牌时绕过密码保护或下载限制访问附件。
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

VendorProductAffected VersionsCPESubscribe
nextcloudsecurity-advisories >= 32.0.0, < 32.0.9 -

II. Public POCs for CVE-2026-45282

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III. Intelligence Information for CVE-2026-45282

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Patches & Fixes for CVE-2026-45282 (1)

Vendor Advisories for CVE-2026-45282 (1)

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

CVE-2026-455458.2 HIGHNextcloud: SQL Injection in Column Type Parameter Allows Arbitrary SQL Execution
CVE-2026-452818.1 HIGHNextcloud: Cross-Account Calendar Takeover via Unauthorized Group-Member-Set Update
CVE-2026-451568.1 HIGHNextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification
CVE-2026-457227.1 HIGHNextcloud: Tables app allows limited SQLi in ORDER BY with malicious sort order argument f
CVE-2026-458106.8 MEDIUMNextcloud: Propfind requests for file comments allowed to load comments for other files
CVE-2026-452756.5 MEDIUMNextcloud: Authorization bypass in approval feature allows unauthorized file sharing with
CVE-2026-452676.5 MEDIUMNextcloud: Missing permission check for from submissions
CVE-2026-452856.4 MEDIUMNextcloud: Hidden Public Link creation when sharing to a Team External Member
CVE-2026-452836.3 MEDIUMNextcloud: Files Lock app allows users to lock and unlock files of other users
CVE-2026-451576.3 MEDIUMNextcloud: Valid share tokens allow to access tempory upload files of share owner
CVE-2026-456905.9 MEDIUMNextcloud: Two-Factor Authentication Bypass via Pending Session Token Replay
CVE-2026-456915.9 MEDIUMNextcloud: Bypass of second factor authentication on DAV endpoints
CVE-2026-455435.3 MEDIUMNextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible t
CVE-2026-451534.6 MEDIUMNextcloud: PIN bypass in PassCodeActivity via back button
CVE-2026-452844.6 MEDIUMNextcloud: Wrong condition in the User OIDC app's LdapService allowed deleted LDAP users t
CVE-2026-452794.4 MEDIUMNextcloud: Limited path traversal via template API if using `{lang}` in config
CVE-2026-452644.3 MEDIUMNextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames
CVE-2026-452864.3 MEDIUMNextcloud: Calendar app leaked user identifiers via attendee suggestion endpoint
CVE-2026-455444.3 MEDIUMNextcloud: Information Disclosure of view filter metdata via Broken Sensitive Data Masking
CVE-2026-451593.5 LOWNextcloud: 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

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