CVE-2021-29438: The Nextcloud dialogs library (npm package @nextcloud/dialogs) before 3.1.2 insufficiently escaped text input

Routine

MEDIUM 4.6UPGRADE

CVE-2021-29438 is a medium-severity flaw (CVSS 4.6) affecting nextcloud\/dialogs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.6 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79, CWE-80
Published	2021-04-13
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nextcloud\/dialogs project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-13 20:15 UTCPublished CVE record published
2026-06-17 03:47 UTCUpdated Record last modified

nextcloud\/dialogs project nextcloud\/dialogs UPGRADE

Affected: < 3.1.2

Fixed in: 3.1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls nextclouddialogs

2. UPGRADE to 3.1.2

npm install nextclouddialogs@">=3.1.2"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-29438?

nextcloud\/dialogs: upgrade to 3.1.2. Exact commands for each OS are on this page.

Is CVE-2021-29438 being exploited?

CVE-2021-29438 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-29438 affect?

CVE-2021-29438 affects nextcloud\/dialogs. Severity is medium (CVSS 4.6). 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 vulne

How urgent is CVE-2021-29438?

Priority 29/100. No elevated risk signals yet.

Software pages

Nextcloud vulnerabilities · npm packages vulnerabilities

References

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