PT-2025-12891

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 3.3.4 Discourse versions prior to 3.4.0.beta5 Description The issue affects Discourse, an open-source discussion platform, where users could be added to group direct messages despite disabling direct messaging in...

PT-2025-12890 · Discourse · Discourse

Name of the Vulnerable Software and Affected Versions: Discourse versions prior to 3.3.4 on the stable branch and prior to 3.4.0.beta5 on the beta branch Description: The issue affects an open-source discussion platform, where a race condition allows someone about to reach the user limit in a gro...

CVE-2025-24972: Missing Authorization

Discourse is an open-source discussion platform. Prior to versions 3.3.4 on the stable branch and 3.4.0.beta5 on the beta branch, in specific circumstances, users could be added to group direct messages despite disabling direct messaging in their preferences. Versions 3.3.4 and 3.4.0.beta5 contai...

Malicious code in discourse-web3auth-theme (npm)

--- -= Per source details. Do not edit below this line.=- Source: ghsa-malware 22290c7662af2d58b4706977dcf0e780e9aa9f028a6d15d75e47831ab96362f7 Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be...

BIT-DISCOURSE-2024-53266 Cross-site Scripting (XSS) via topic titles when CSP disabled in Discourse

Discourse is an open source platform for community discussion. In affected versions with some combinations of plugins, and with CSP disabled, activity streams in the user's profile page may be vulnerable to XSS. This has been patched in the latest version of Discourse core. Users are advised to...

BIT-DISCOURSE-2024-53851 Partial denial of service via inline oneboxes in Discourse

Discourse is an open source platform for community discussion. In affected versions the endpoint for generating inline oneboxes for URLs wasn't enforcing limits on the number of URLs that it accepted, allowing a malicious user to inflict denial of service on some parts of the app. This...

BIT-DISCOURSE-2024-53994 Potential bypass of chat permissions in Discourse

Discourse is an open source platform for community discussion. In affected versions users who disable chat in preferences could still be reachable in some cases. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should disable...

BIT-DISCOURSE-2024-55948 Anonymous cache poisoning via XHR requests in Discourse

Discourse is an open source platform for community discussion. In affected versions an attacker can make craft an XHR request to poison the anonymous cache for example, the cache may have a response with missing preloaded data. This issue only affects anonymous visitors of the site. This problem...

BIT-DISCOURSE-2024-56197 Users can see other user's tagged PMs in Discourse

Discourse is an open source platform for community discussion. PM titles and metadata can be read by other users when the "PM tags allowed for groups" option is enabled, the other user is a member of a group added to this option, and the PM has been tagged. This issue has been patched in the late...

BIT-DISCOURSE-2024-56328 HTMLi(XSS without CSP) via Onebox urls in Discourse

Discourse is an open source platform for community discussion. An attacker can execute arbitrary JavaScript on users' browsers by posting a maliciously crafted onebox url. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are...

BIT-DISCOURSE-2025-23023 Anonymous cache poisoning via request headers in Discourse

Discourse is an open source platform for community discussion. In affected versions an attacker can carefully craft a request with the right request headers to poison the anonymous cache for example, the cache may have a response with missing preloaded data. This issue only affects anonymous...

CVE-2025-22601

Discourse is an open source platform for community discussion. In affected versions an attacker can trick a target user to make changes to their own username via carefully crafted link using the activate-account route. This problem has been patched in the latest version of Discourse. Users are...

CVE-2024-56197

Discourse is an open source platform for community discussion. PM titles and metadata can be read by other users when the "PM tags allowed for groups" option is enabled, the other user is a member of a group added to this option, and the PM has been tagged. This issue has been patched in the late...

CVE-2025-22602

Discourse is an open source platform for community discussion. In affected versions an attacker can execute arbitrary JavaScript on users' browsers by posting a malicious video placeholder html element. This issue only affects sites with CSP disabled. This problem has been patched in the latest...

CVE-2024-56328

Discourse is an open source platform for community discussion. An attacker can execute arbitrary JavaScript on users' browsers by posting a maliciously crafted onebox url. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are...

CVE-2024-53266

Discourse is an open source platform for community discussion. In affected versions with some combinations of plugins, and with CSP disabled, activity streams in the user's profile page may be vulnerable to XSS. This has been patched in the latest version of Discourse core. Users are advised to...

CVE-2024-53851

Discourse is an open source platform for community discussion. In affected versions the endpoint for generating inline oneboxes for URLs wasn't enforcing limits on the number of URLs that it accepted, allowing a malicious user to inflict denial of service on some parts of the app. This...

CVE-2024-53994

Discourse is an open source platform for community discussion. In affected versions users who disable chat in preferences could still be reachable in some cases. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should disable...

CVE-2024-55948

Discourse is an open source platform for community discussion. In affected versions an attacker can make craft an XHR request to poison the anonymous cache for example, the cache may have a response with missing preloaded data. This issue only affects anonymous visitors of the site. This problem...

CVE-2021-37633

Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest...