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CVE-2021-22878

MEDIUM
4.8
CVSS Score
Published: March 3, 2021 at 05:39 PM UTC
Updated: June 17, 2026 at 03:37 AM UTC
2 products affected across 2 vendorsFedoraNextcloud/server

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Severity
MEDIUM4.8
Exploit prediction
EPSS 1%

Description

Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
34
Nextcloud/server· Nextcloudnextcloud-app
95%
v < 20.0.6
Vendor states this is fixed in 20.0.6 (unaffected)

References (4)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/nextcloud/server/pull/25234
x_refsource_MISCExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/896522
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://nextcloud.com/security/advisory/?id=NC-SA-2021-005

CVSS

4.8MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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