CVE-2026-45155— Nextcloud: Private circle can be added to another circle via API
Possible ATT&CK Techniques 1AI
T1114 · Email CollectionAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nextcloud | security-advisories | >= 32.0.0, < 32.0.7 | affected |
>= 33.0.0, < 33.0.1 | affected |
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I. Basic Information for CVE-2026-45155
Vulnerability Information
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Vulnerability Title
Nextcloud: Private circle can be added to another circle via API
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.7 and 33.0.0 to before 33.0.1, a missing access check on API level allowed to add unknown circles by their ID directly to other circles. Since circle IDs have 62^15 complexity by default this is still unlikely to be executable at will, but if access to an ID was available via another source, memberships could be tracked like this. It is recommended that the Nextcloud Server is upgraded to 32.0.7 or 33.0.1. It is recommended that the Nextcloud Enterprise Server is upgraded to 29.0.16.14, 30.0.17.8, 31.0.14.3, 32.0.7 or 33.0.1
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| nextcloud | security-advisories | >= 32.0.0, < 32.0.7 | - |
II. Public POCs for CVE-2026-45155
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Patches & Fixes for CVE-2026-45155 (1)
Vendor Advisories for CVE-2026-45155 (1)
Exploits & Public PoCs for CVE-2026-45155 (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-2026-45267 | 6.5 MEDIUM | Nextcloud: Missing permission check for from submissions |
| CVE-2026-45275 | 6.5 MEDIUM | Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with |
| 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-2026-45691 | 5.9 MEDIUM | Nextcloud: Bypass of second factor authentication on DAV endpoints |
| CVE-2026-45690 | 5.9 MEDIUM | Nextcloud: Two-Factor Authentication Bypass via Pending Session Token Replay |
| 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-2026-45264 | 4.3 MEDIUM | Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: security-advisories
- CVE-2026-24754
Kiteworks Secure Data Forms Vulnerable to Cross-site Scripti - CVE-2026-45810
Nextcloud: Propfind requests for file comments allowed to lo - CVE-2026-45722
Nextcloud: Tables app allows limited SQLi in ORDER BY with m - CVE-2026-45691
Nextcloud: Bypass of second factor authentication on DAV end - CVE-2026-45690
Nextcloud: Two-Factor Authentication Bypass via Pending Sess
Same vendor: nextcloud
- CVE-2026-45810
Nextcloud: Propfind requests for file comments allowed to lo - CVE-2026-45722
Nextcloud: Tables app allows limited SQLi in ORDER BY with m - CVE-2026-45691
Nextcloud: Bypass of second factor authentication on DAV end - CVE-2026-45690
Nextcloud: Two-Factor Authentication Bypass via Pending Sess - CVE-2026-45545
Nextcloud: SQL Injection in Column Type Parameter Allows Arb
Same weakness: CWE-639
- CVE-2026-24761
Kiteworks Secure Data Forms is vulnerable to Authorization B - CVE-2026-24756
Kiteworks Secure Data Forms is vulnerable to Authorization B - CVE-2026-24755
Kiteworks Secure Data Forms is vulnerable to Authorization B - CVE-2026-24753
Kiteworks Secure Data Forms is vulnerable to Authorization B - CVE-2026-23638
Kiteworks Secure Data Forms is vulnerable to Authorization B
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