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CVE-2021-32733— XSS in Nextcloud Text application

CVSS 4.8 · Medium EPSS 0.17% · P37
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I. Basic Information for CVE-2021-32733

Vulnerability Information
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Vulnerability Title
XSS in Nextcloud Text application
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nextcloud 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Text在19.0.13、20.0.11和21.0.3之前的版本中存在跨站脚本漏洞，该漏洞是一个跨站脚本漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
nextcloudsecurity-advisories < 19.0.13 -

II. Public POCs for CVE-2021-32733

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III. Intelligence Information for CVE-2021-32733

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Same Patch Batch · nextcloud · 2021-07-12 · 14 CVEs total

CVE-2021-326888.8 HIGHApplication specific tokens can change their own scope
CVE-2021-326898.1 HIGHNextcloud Talk not properly disassociating users from chats after account deletion
CVE-2021-327267.1 HIGHWebauthn tokens not removed after user has been deleted
CVE-2021-327275.7 MEDIUMEnd-to-end encryption device setup did not verify public key
CVE-2021-327415.3 MEDIUMLack of ratelimit on public share link mount endpoint
CVE-2021-327055.3 MEDIUMLack of ratelimit on public DAV endpoint
CVE-2021-327035.3 MEDIUMLack of ratelimit on shareinfo endpoint
CVE-2021-327074.3 MEDIUMBypass of image blocking in Nextcloud Mail
CVE-2021-326783.7 LOWRatelimit not applied on OCS API responses
CVE-2021-327253.5 LOWDefault share permissions not respected for federated reshares
CVE-2021-326793.5 LOWFilenames not escaped by default in controllers using DownloadResponse
CVE-2021-326803.3 LOWAudit log is not properly logging unsetting of share expiration date
CVE-2021-327343.1 LOWFile path disclosure of shared files in Nextcloud Text application

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-79

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