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CVE-2026-77166

Quick assessment

Affected
Nextcloud Collectives
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.

页面表情更新接口中的“emoji”字段未对用户输入进行充分验证。通过注入超长文本和换行符，可导致侧边栏布局错乱，并可能遮挡其他内容。

AI Predicted 3.1 Difficulty: Easy EPSS 0.28% · P21

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Nextcloud Collectives 3.2.1≤ 3.5.0 affected
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I. Basic Information for CVE-2026-77166

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
The emoji field in the page emoji update endpoint does not properly validate user input. By injecting long text and line breaks, the sidebar layout becomes broken and can hide other items.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
业务逻辑错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Nextcloud Collectives 3.2.1 ~ 3.5.0 -

II. Public POCs for CVE-2026-77166

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77166

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Other References for CVE-2026-77166 (1)

IV. Related Vulnerabilities

Same product: Collectives
Same vendor: Nextcloud
Same weakness: CWE-840