PT-2021-15250 · Nextcloud+1 · Nextcloud Server+1

Yzy9951 + 1 · Published 2021-03-03 · Updated 2022-01-01 · CVE-2021-22878

Positive Technologies (AI Summary)

CVSS v3.1

4.8

Medium

Base vector

AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Nextcloud Server versions prior to 20.0.6

Description The issue is related to reflected cross-site scripting (XSS) due to a lack of sanitization in the OC.Notification.show function. This allows for potential XSS attacks.

Recommendations For versions prior to 20.0.6, update to version 20.0.6 or later to resolve the issue. As a temporary workaround, consider restricting the use of the OC.Notification.show function until a patch is applied.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

ALT-PU-2021-3108

ALT-PU-2021-3224

CVE-2021-22878

Affected Products

Alt Linux

Nextcloud Server

References · 7

• 🔥 https://hackerone.com/reports/896522 · Exploit
• https://github.com/nextcloud/server/pull/25234 · Patch
• https://nextcloud.com/security/advisory/?id=NC-SA-2021-005 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-22878 · Security Note
• https://osv.dev/vulnerability/CVE-2021-22878 · Vendor Advisory
• https://t.me/cvenotify/11086 · Telegram Post