SB2026012948 - Multiple vulnerabilities in Discourse

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Main Vulnerability Database SB2026012948

SB2026012948 - Multiple vulnerabilities in Discourse

Published: January 29, 2026 Updated: July 1, 2026

Security Bulletin ID SB2026012948
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 14
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 57% Low 43%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 14 vulnerabilities.


1) Stored cross-site scripting (CVE-ID: CVE-2025-66488)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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


The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within S3 for uploads. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


2) Incorrect authorization (CVE-ID: CVE-2025-68660)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote attacker to bypass authorization process.

The vulnerability exists due to incorrect authorization. A remote user can bypass the ai_discover_persona access controls to impersonate user.


3) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2025-68659)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

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


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to allocation of resources without limits or throttling in username change endpoint. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.


4) Incorrect authorization (CVE-ID: CVE-2025-68666)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote user to bypass authorization process.

The vulnerability exists due to incorrect authorization. A remote administrator can view users archives.


5) Incorrect authorization (CVE-ID: CVE-2025-69218)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote attacker to bypass authorization process.

The vulnerability exists due to incorrect authorization. A remote user can access the top_uploads admin report to gain access to sensitive information.


6) Incorrect authorization (CVE-ID: CVE-2025-69289)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote user to bypass authorization process.

The vulnerability exists due to insecure default configuration. A remote administrator can bypass email-change restrictions and takeover non-staff accounts.


7) Incorrect authorization (CVE-ID: CVE-2026-24742)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote attacker to bypass authorization process.

The vulnerability exists due to incorrect authorization. A remote user can view sensitive information in staff action logs.


8) Missing Authorization (CVE-ID: CVE-2025-68479)

CWE-ID: CWE-862 - Missing Authorization

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


The vulnerability allows a remote attacker to bypass authorization process.

The vulnerability exists due to subscription endpoints lack proper checking for ownership before making changes. A remote user can takeover subscriptions.


9) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2025-68662)

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

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


The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to hostname validation issue in FinalDestination. A remote user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.


10) Information disclosure (CVE-ID: CVE-2026-23743)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to permalinks to restricted resources leak resource slugs. A remote attacker can gain unauthorized access to sensitive information on the system.


11) Missing Authorization (CVE-ID: CVE-2026-21865)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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 authorization process.

The vulnerability exists due to missing authorization. A remote administrator can convert some personal messages to public topics.


12) Incorrect authorization (CVE-ID: CVE-2025-68933)

CWE-ID: CWE-863 - Incorrect Authorization

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


The vulnerability allows a remote user to bypass authorization process.

The vulnerability exists due to incorrect authorization. A remote administrator can change ownership of posts in private messages and restricted categories they cannot access to exfiltrate private content.


13) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2025-68934)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

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:Green


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to allocation of resources without limits or throttling in Drafts Creation Endpoint. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.


14) Cross-site scripting (CVE-ID: CVE-2025-67723)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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


The vulnerability allows a remote user to perform cross-site scripting.

The vulnerability exists due to improper neutralization of input during web page generation in the discourse-math plugin KaTeX variant when rendering mathematical content. A remote user can submit specially crafted content to perform cross-site scripting.

Content Security Policy mitigates the impact, and user interaction is required to view the crafted content.


Remediation

Install update from vendor's website.

References