CVE-2021-32733
mediumpriority · track · 24EPSS 0.011 · 66 %ileEUUSEPSS · scored 2026-10-27
Nextcloud Text is a collaborative document editing application that uses Markdown. A cross-site scripting vulnerability is present in versions prior to 19.0.13, 20.0.11, and 21.0.3. The Nextcloud Text application shipped with Nextcloud server used a `text/html` Content-Type when serving files to users. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. As a workaround, use a browser that has support for Content-Security-Policy.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (6)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (11)
External citations — patches, advisories, analysis.
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x4w3-jhcr-57pqcnnvd
- https://github.com/nextcloud/text/pull/1689cnnvd
- https://hackerone.com/reports/1241460cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-32733cnnvd
- https://www.cybersecurity-help.cz/vdb/SB2021071213cnnvd
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x4w3-jhcr-57pqenisa_euvd
- https://github.com/nextcloud/text/pull/1689enisa_euvd
- https://hackerone.com/reports/1241460enisa_euvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan