Medium severity · published Aug 10, 2023
CVE-2023-39955
Notes attachment render HTML in preview mode
6.1
CVSS
0.6%
EPSS
No
On KEV
Description
Notes is a note-taking app for Nextcloud, an open-source cloud platform. Starting in version 4.4.0 and prior to version 4.8.0, when creating a note file with HTML, the content is rendered in the preview instead of the file being offered to download. Nextcloud Notes app version 4.8.0 contains a patch for the issue. No known workarounds are available.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
>= 4.4.0, < 4.8.0 · source: vendor
NO
Notes · Nextcloud
4.4.0 before 4.8.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-39955
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-39955
Patch
https://github.com/nextcloud/notes/pull/1031
Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6g88-37x7-4vw6
Third Party Advisory
https://hackerone.com/reports/1924355
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