CVE-2026-82980
Quick assessment
Affected
Nextcloud Files Lock
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.
Any authenticated user can lock or unlock files they do not own by targeting absolute WebDAV paths of other users. The DAV plugin resolves files from the absolute request URI without verifying that the path segment matches the authenticated session user. This
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I. Basic Information for CVE-2026-82980
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Any authenticated user can lock or unlock files they do not own by targeting absolute WebDAV paths of other users. The DAV plugin resolves files from the absolute request URI without verifying that the path segment matches the authenticated session user. This enables:
Cross-user manual locks : attacker locks a victim's files, blocking writes (PUT/MOVE/DELETE, editor saves).
Lock-token disclosure: the app returns the lock token to unauthorized callers, enabling them to remove token-based locks (client locks) of other users.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Nextcloud | Files Lock | 31.0.0 ~ 33.0.0 | - |
|
II. Public POCs for CVE-2026-82980
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-82980 (1)
Same Patch Batch · Nextcloud · 2026-09-18 · 7 CVEs total
| CVE-2026-77169 | Nextcloud团队文件夹应用权限绕过漏洞 | |
| CVE-2026-77170 | Deck配置API越权设置任意看板配置漏洞 | |
| CVE-2026-77164 | Nextcloud Circles盲SSRF漏洞 | |
| CVE-2026-82982 | CVE-2026-82982 | |
| CVE-2026-82985 | CVE-2026-82985 | |
| CVE-2026-68493 | CVE-2026-68493 |
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V. Comments for CVE-2026-82980
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