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Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in @nextcloud/dialogs

Moderate severity GitHub Reviewed Published Apr 13, 2021 in nextcloud-libraries/nextcloud-dialogs • Updated Feb 1, 2023

Package

npm @nextcloud/dialogs (npm)

Affected versions

< 3.1.2

Patched versions

3.1.2

Description

Impact

The Nextcloud dialogs library before 3.1.2 did insufficiently escape text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability.

Note: Nextcloud Server employs a strict Content Security Policy that mitigates the risk of these XSS vulnerabilities.

Patches

The vulnerability has been patched in version 3.1.2. If you need to display HTML in the toast, explicitly pass the options.isHTML config flag.

Workarounds

Make sure no user-supplied input flows into toasts.

References

@LukasReschke LukasReschke published to nextcloud-libraries/nextcloud-dialogs Apr 13, 2021
Reviewed Apr 13, 2021
Published by the National Vulnerability Database Apr 13, 2021
Published to the GitHub Advisory Database Apr 16, 2021
Last updated Feb 1, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

EPSS score

0.054%
(25th percentile)

Weaknesses

CVE ID

CVE-2021-29438

GHSA ID

GHSA-g3fq-3v3g-mh32

Source code

No known source code
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