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CVE-2026-77167

Quick assessment

Affected
Nextcloud server
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.

攻击者可通过滥用联邦共享端点，向 数据库表中写入任意行记录。这些记录将永久留存，系统缺乏自动清理机制。由此产生的三种独立拒绝服务（DoS）条件均源自同一未认证来源，并且只要注入的行记录仍存在于数据库中，便会每 24 小时自动触发一次，形成自我持续的攻击循环。

AI Predicted 7.5 Difficulty: Easy
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I. Basic Information for CVE-2026-77167

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Abusing the federated share endpoint, an attacker can write arbitrary rows into the oc_share_external database table. These rows persist indefinitely — there is no automatic cleanup mechanism. Three distinct denial-of-service conditions follow from this write primitive, all triggered from the same unauthenticated source and all self-renewing on a 24-hour cycle for as long as the injected rows remain in the database.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Nextcloud server 22.0.0 ~ 34.0.0 -

II. Public POCs for CVE-2026-77167

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III. Intelligence Information for CVE-2026-77167

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Other References for CVE-2026-77167 (1)

Same Patch Batch · Nextcloud · 2026-10-27 · 9 CVEs total

CVE-2026-87897 Whiteboard SSRF 漏洞：泄露 JWT 并获读写权限
CVE-2026-77173 LibreOffice 文件命名含#致敏感信息未标记
CVE-2026-77172 应用密码绕过敏感端点密码确认漏洞
CVE-2026-77171 公共共享集体链接允许创建页面漏洞
CVE-2026-82983 Tables 应用分享端点未验证权限导致信息泄露
CVE-2026-82986 Tableau 用户可绕过管理员设置的分组链接共享限制。
CVE-2026-82984 某软件资源 API 存在越权枚举漏洞
CVE-2026-67400 WOPI 配置信息泄露：缺失 Token 类型检查

IV. Related Vulnerabilities

Same product: server
Same vendor: Nextcloud
Same weakness: CWE-400