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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.

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.

EPSS 0.19% · P9

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

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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 vendor: Nextcloud
Same weakness: CWE-840

V. Comments for CVE-2026-77166

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