CVE-2026-77164— Nextcloud Circles盲SSRF漏洞
一分钟漏洞结论
影响对象
Nextcloud Server
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Circles' remote-instance signature verification fetches the attacker-supplied keyId URL before trust in the remote instance is established, and explicitly allows local/private addresses for this request, bypassing Nextcloud's core SSRF protections. The public,
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一、 漏洞 CVE-2026-77164 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
N/A
来源: CVE Program / CVE List V5
Vulnerability Description
Circles' remote-instance signature verification fetches the attacker-supplied keyId URL before trust in the remote instance is established, and explicitly allows local/private addresses for this request, bypassing Nextcloud's core SSRF protections. The public, unauthenticated endpoints POST /apps/circles/event/ and POST /apps/circles/incoming/ reach this code path, allowing any unauthenticated user to force the server to issue a GET request to an internal address.
The response body of the internal request is never returned to the requester, so this is blind SSRF: an attacker can determine whether an internal service is reachable, but cannot read its response contents through this endpoint alone.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-77164 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-77164 其他参考 (1)
同批安全公告 · Nextcloud · 2026-09-18 · 共 7 条
| 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-2026-82982 | CVE-2026-82982 | |
| CVE-2026-82980 | CVE-2026-82980 | |
| CVE-2026-82985 | CVE-2026-82985 | |
| CVE-2026-68493 | CVE-2026-68493 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-77164
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