How severe is CVE-2021-29438?

CVE-2021-29438 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-29438 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29438?

CVE-2021-29438 affects Nextcloud/dialogs Project Nextcloud/dialogs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29438?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-29438 published?

CVE-2021-29438 was published on 2021-04-13 and last updated on 2026-06-17.

CVE-2021-29438

CVE-2021-29438 is a medium-severity vulnerability in Nextcloud/dialogs Project Nextcloud/dialogs with a CVSS 3.x base score of 4.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.6)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Nextcloud/dialogs Project Nextcloud/dialogs
Published: 2021-04-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-29438?: 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.
How severe is CVE-2021-29438?: CVE-2021-29438 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-29438 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29438?: CVE-2021-29438 affects Nextcloud/dialogs Project Nextcloud/dialogs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29438?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-29438 published?: CVE-2021-29438 was published on 2021-04-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud\/dialogs_project:nextcloud\/dialogs:*:*:*:*:*:node.js:*:*

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