CVE-2023-48302

Name: CVE-2023-48302
Creator: NVD / NIST
Published: 2023-11-21T22:15:07.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2023-48302 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and Nextcloud Enterprise Server, when a user is tricked into copy pasting HTML code without markup (Ctrl+Shift+V) the markup will actually render. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and Nextcloud Enterprise Server, when a user is tricked into copy pasting HTML code without markup (Ctrl+Shift+V) the markup will actually render. Nextcloud Server and Nextcloud Enterprise Server versions 25.0.13, 26.0.8, and 27.1.3 contain a fix for this issue. As a workaround, disable app text.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.57%

42.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	>= 25.0.0, < 25.0.13
Nextcloud	Nextcloud Server	>= 26.0.0, < 26.0.8
Nextcloud	Nextcloud Server	>= 27.0.0, < 27.1.3

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p7g9-x25m-4h87Vendor Advisory
https://github.com/nextcloud/text/pull/4877Patch
https://hackerone.com/reports/2211561Permissions Required
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p7g9-x25m-4h87Vendor Advisory
https://github.com/nextcloud/text/pull/4877Patch
https://hackerone.com/reports/2211561Permissions Required

Timeline

Published: Nov 21, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-48302?

How severe is CVE-2023-48302?

CVE-2023-48302 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2023-48302?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-48302?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST