CVE-2021-29438

Name: CVE-2021-29438
Creator: NVD / NIST
Published: 2021-04-13T20:15:22.187+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2021-29438 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. The Nextcloud dialogs library (npm package @nextcloud/dialogs) before 3.1.2 insufficiently escaped text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

Description

The Nextcloud dialogs library (npm package @nextcloud/dialogs) before 3.1.2 insufficiently escaped text input passed to a toast. If your application displays toasts with user-supplied input, this could lead to a XSS vulnerability. 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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.70%

48.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud\/Dialogs Project	Nextcloud\/Dialogs	< 3.1.2

References

Timeline

Published: Apr 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29438?

How severe is CVE-2021-29438?

CVE-2021-29438 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29438?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-29438?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST