What’s Vulnerable › Vulnerabilities

CVE-2017-0891

• Severity: medium (CVSS 5.4 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-05-08 · updated 2026-06-17
• Weakness: CWE-79

Description

Nextcloud Server before 9.0.58 and 10.0.5 and 11.0.3 are vulnerable to an inadequate escaping of error messages leading to XSS vulnerabilities in multiple components.

Affected products

• Nextcloud Server: before 9.0.58; from 10.0.0 before 10.0.5; from 11.0.0 before 11.0.3 — fixed in 10.0.5, 11.0.3, 9.0.58

How to fix

Upgrade to a fixed version: Nextcloud Server 10.0.5, 11.0.3, 9.0.58. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/216812
• https://nextcloud.com/security/advisory/?id=nc-sa-2017-008
• https://hackerone.com/reports/216812
• https://nextcloud.com/security/advisory/?id=nc-sa-2017-008

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