SB2023072855 - Multiple vulnerabilities in Discourse

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Main Vulnerability Database SB2023072855

SB2023072855 - Multiple vulnerabilities in Discourse

Published: July 28, 2023 Updated: July 1, 2026

Security Bulletin ID SB2023072855
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Input validation error (CVE-ID: CVE-2023-36466)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to bypass topic title validation checks.

The vulnerability exists due to improper input validation in the topic editing functionality when changing a topic category. A remote user can modify a topic in a way that skips title validation checks to bypass topic title validation checks.

User interaction is required to edit the topic.


2) Use of insufficiently random values (CVE-ID: CVE-2023-36473)

CWE-ID: CWE-330 - Use of Insufficiently Random Values

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to bypass CSP protection and execute cross-site scripting attacks.

The vulnerability exists due to improper reuse of a CSP nonce in Content Security Policy handling when processing content that relies on the nonce for script authorization. A remote user can leverage a discovered cross-site scripting vector to bypass CSP protection and execute cross-site scripting attacks.

There are no known cross-site scripting vectors at the moment, but any such vector could use this issue to completely bypass CSP.


3) Input validation error (CVE-ID: CVE-2023-36818)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to improper input validation in custom sidebar section creation or update handling when processing requests to create or update custom sidebar sections. A remote user can send a specially crafted request with unlimited link creation to cause a denial of service.


4) Improper access control (CVE-ID: CVE-2023-38685)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to improper access control in restricted-visibility topic tags when handling requests for tag information. A remote user can access restricted tag information to disclose sensitive information.


Remediation

Install update from vendor's website.

References