CVE-2021-39222

mediumpriority · track · 24EPSS 0.011 · 65 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.10% (65th) EPSS

CVSS 4.3 · medium

Is it mine?

8 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Talk application was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Talk application is upgraded to patched versions 10.0.7, 10.1.4, 11.1.2, 11.2.0 or 12.0.0. As a workaround, use a browser that has support for Content-Security-Policy.

cvss

Technical severity, 0–10. One row per scoring source.

6.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.16.4mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.16.4mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · security-advisories@github.comexploitability 1.2 · impact 5.2

v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-434US

affected products (8)

Products and version ranges known to be affected.

nextcloud security-advisories≤ < 10.0.7enisa_euvdEU
nextcloud security-advisories≤ < 11.2.0enisa_euvdEU
nextcloud security-advisories10.1.0, → 10.1.4enisa_euvdEU
nextcloud security-advisories11.1.0, → 11.1.2enisa_euvdEU
nextcloud security-advisories12.0.0.alpha-1, → 12.0.0enisa_euvdEU
nextcloud talk< 10.0.7nvdUScpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:*
nextcloud talk10.1.0 → 10.1.4nvdUScpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:*
nextcloud talk11.0.0 → 11.1.2nvdUScpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:*

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-11-15modified 2026-06-17

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+53041 more

references (12)

External citations — patches, advisories, analysis.

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