Read the docs
TI-2020-06573 Aliases CVE-2020-8155GHSA-xqxr-66xr-xfq3

Cross-site scripting in Nextcloud Server

Priority LOW 27CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
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

An outdated 3rd party library in the Files PDF viewer for Nextcloud Server 18.0.2 caused a Cross-site scripting vulnerability when opening a malicious PDF.

Why it matters now

EPSS 0.01138 66th 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
—Nextcloud Server18.0.3—No fix listedCNA
  • Nextcloud Server Vendor— Affected 18.0.3 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*before 18.0.3Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions before 18.0.3 Vulnerable ·nextcloud

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Nextcloud Server — openSUSE-SU-2020:0667

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2020-06572 Authorization bypass in Nextcloud ServerPriority LOW 37
    Show all 2 records → Advisory →
  • Advisory ·

    Nextcloud Server — openSUSE-SU-2020:0668

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2020-06572 Authorization bypass in Nextcloud ServerPriority LOW 37
    Show all 2 records → Advisory →
Show 1 more group
  • Advisory ·

    Nextcloud Server — openSUSE-SU-2020:0670

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2020-06572 Authorization bypass in Nextcloud ServerPriority LOW 37
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-8155
  2. 2026-10-03 Alias added: GHSA-xqxr-66xr-xfq3

References

Advisory 6

  • TI-2023-20855 Users can delete external storage mount points CVSS 3.1HIGH 7.7
  • TI-2023-11091 Nextcloud download permissions can be changed by resharer CVSS 3.1HIGH 7.5
  • TI-2023-10624 Nextcloud Server vulnerable to SSRF via filter bypass due to lax checking on IPs CVSS 3.1MEDIUM 5.3
  • TI-2025-37238 Cross-site scripting in Nextcloud CVSS 3.1MEDIUM 6.4
  • TI-2023-11086 nextcloud vulnerable to Uncontrolled Resource Consumption CVSS 3.1MEDIUM 6.5
  • TI-2022-18738 Exception logging in Sharepoint app reveals clear-text connection details CVSS 3.1MEDIUM 6.5
See all 188 →

Sources

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