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TI-2018-02759 Aliases CVE-2018-3763GHSA-5pqm-hfmj-g8jg

Cross-site scripting in Nextcloud Calendar application

Priority LOW 23CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

In Nextcloud Calendar before 1.5.8 and 1.6.1, a missing sanitization of search results for an autocomplete field could lead to a stored XSS requiring user-interaction. The missing sanitization only affected group names, hence malicious search results could only be crafted by privileged users like admins or group admins.

Why it matters now

EPSS 0.00614 49th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudNextcloud Calendar application<1.6.1, <1.5.8—No fix listedCNA
  • Nextcloud Calendar application Vendornextcloud Affected <1.6.1, <1.5.8 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*before 1.5.8Vulnerablenextcloud
cpe:2.3:a:nextcloud:calendar:1.6.0:*:*:*:*:*:*:*1.6.0Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:* Versions before 1.5.8 Vulnerable ·nextcloud
  • cpe:2.3:a:nextcloud:calendar:1.6.0:*:*:*:*:*:*:* Versions 1.6.0 Vulnerable ·nextcloud

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-3763
  2. 2026-10-03 Alias added: GHSA-5pqm-hfmj-g8jg

References

Advisory 1

  • TI-2022-08650 Command Injection in Appointment Emails for Nextcloud Calendar CVSS 3.1CRITICAL 9.8
  • TI-2023-24171 Inviting excessive long email addresses to a calendar event makes the Nextcloud server unresponsive CVSS 3.1MEDIUM 4.3
  • TI-2023-26171 Calendar app returns full stacktrace when an error happens while editing appointment CVSS 3.1MEDIUM 6.5
  • TI-2025-40933 Nextcloud Calendar app used predictable proposal participant tokens CVSS 3.1MEDIUM 6.5
  • TI-2025-40961 Nextcloud Calendar attachments of local files are offered to downloaded CVSS 3.1MEDIUM 5.7
  • TI-2024-24828 Nextcloud Calendar's event create can create attachments that link to other websites CVSS 3.1MEDIUM 4.6
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences