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CVE-2024-23834

Discourse improperly sanitized user input leads to XSS

Discourse is an open-source discussion platform. Improperly sanitized user input could lead to an XSS vulnerability in some situations. This vulnerability only affects Discourse instances which have disabled the default Content Security Policy. The vulnerability is patched in 3.1.5 and 3.2.0.beta5. As a workaround, ensure Content Security Policy is enabled and does not include `unsafe-inline`.

CVSS 3.1 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-47120

Discourse DoS through Onebox favicon URL

Discourse is an open source platform for community discussion. In versions 3.1.0 through 3.1.2 of the `stable` branch and versions 3.1.0,beta6 through 3.2.0.beta2 of the `beta` and `tests-passed` branches, Redis memory can be depleted by crafting a site with an abnormally long favicon URL and drafting multiple posts which Onebox it. The issue is patched in version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches. There are no known workarounds.

CVSS 3.1 · 7.5 High EPSS 1.2% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-47119

HTML injection in oneboxed links

Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, some links can inject arbitrary HTML tags when rendered through our Onebox engine. The issue is patched in version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches. There are no known workarounds.

CVSS 3.1 · 5.3 Medium EPSS 1.1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-46130

Bypassing height value allowed in some theme components

Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, some theme components allow users to add svgs with unlimited `height` attributes, and this can affect the availability of subsequent replies in a topic. Most Discourse instances are unaffected, only instances with the svgbob or the mermaid theme component are within scope. The issue is patched in version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches. As a workaround, disable or remove the relevant theme components.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-45816

Unread bookmark reminder notifications that the user cannot access can be seen

Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, there is an edge case where a bookmark reminder is sent and an unread notification is generated, but the underlying bookmarkable (e.g. post, topic, chat message) security has changed, making it so the user can no longer access the underlying resource. As of version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, bookmark reminders are now no longer sent if the user does not have access to the underlying bookmarkable, and also the unread bookmark notifications are always filtered by access. There are no known workarounds.

CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-45806

Discourse vulnerable to DoS via Regexp Injection in Full Name

Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, if a user has been quoted and uses a `|` in their full name, they might be able to trigger a bug that generates a lot of duplicate content in all the posts they've been quoted by updating their full name again. Version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches contain a patch for this issue. No known workaround exists, although one can stop the "bleeding" by ensuring users only use alphanumeric characters in their full name field.

CVSS 3.1 · 4.3 Medium EPSS 1.2% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-45147

Arbitrary keys can be added to a topic's custom fields by any user in Discourse

Discourse is an open source community platform. In affected versions any user can create a topic and add arbitrary custom fields to a topic. The severity of this vulnerability depends on what plugins are installed and how the plugins uses topic custom fields. For a default Discourse installation with the default plugins, this vulnerability has no impact. The problem has been patched in the latest version of Discourse. Users are advised to update to version 3.1.1 if they are on the stable branch or 3.2.0.beta2 if they are on the beta branch. Users unable to upgrade should disable any plugins that access topic custom fields.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-45131

Unauthenticated access to new private chat messages in Discourse

Discourse is an open source platform for community discussion. New chat messages can be read by making an unauthenticated POST request to MessageBus. This issue is patched in the 3.1.1 stable and 3.2.0.beta2 versions of Discourse. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS 3.1 · 7.5 High EPSS 4.0% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-44391

Prevent unauthorized access to summary details in Discourse

Discourse is an open source platform for community discussion. User summaries are accessible for anonymous users even when `hide_user_profiles_from_public` is enabled. This problem has been patched in the 3.1.1 stable and 3.2.0.beta2 version of Discourse. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-44388

Malicious requests can fill up the log files resulting in a deinal of service in Discourse

Discourse is an open source platform for community discussion. A malicious request can cause production log files to quickly fill up and thus result in the server running out of disk space. This problem has been patched in the 3.1.1 stable and 3.2.0.beta2 versions of Discourse. It is possible to temporarily work around this problem by reducing the `client_max_body_size nginx directive`. `client_max_body_size` will limit the size of uploads that can be uploaded directly to the server.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-44384

Discourse-Jira could make SSRF attack by setting Jira URL to an arbitrary location

Discourse-jira is a Discourse plugin allows Jira projects, issue types, fields and field options will be synced automatically. An administrator user can make an SSRF attack by setting the Jira URL to an arbitrary location and enabling the `discourse_jira_verbose_log` site setting. A moderator user could manipulate the request path to the Jira API, allowing them to perform arbitrary GET requests using the Jira API credentials, potentially with elevated permissions, used by the application.

CVSS 3.1 · 4.1 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse Jira
CVE-2023-43814

Exposure of poll options and votes to unauthorized users in Discourse

Discourse is an open source platform for community discussion. Attackers with details specific to a poll in a topic can use the `/polls/grouped_poll_results` endpoint to view the content of options in the poll and the number of votes for groups of poll participants. This impacts private polls where the results were intended to only be viewable by authorized users. This issue is patched in the 3.1.1 stable and 3.2.0.beta2 versions of Discourse. There is no workaround for this issue apart from upgrading to the fixed version.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-43659

Cross-site Scripting via email preview when CSP disabled in Discourse

Discourse is an open source platform for community discussion. Improper escaping of user input allowed for Cross-site Scripting attacks via the digest email preview UI. This issue only affects sites with CSP disabled. This issue has been patched in the 3.1.1 stable release as well as the 3.2.0.beta1 release. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.

CVSS 3.1 · 8 High EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-43658

Improper escaping of user input in discourse-calendar

dicourse-calendar is a plugin for the Discourse messaging platform which adds the ability to create a dynamic calendar in the first post of a topic. Improper escaping of event titles could lead to Cross-site Scripting (XSS) within the 'email preview' UI when a site has CSP disabled. Having CSP disabled is a non-default configuration, so the vast majority of sites are unaffected. This problem is resolved in the latest version of the discourse-calendar plugin. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.

CVSS 3.1 · 8 High EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse Calendar
CVE-2023-43657

Improper escaping of encrypted topic titles can lead to Cross-site Scripting under non-default site configuration

discourse-encrypt is a plugin that provides a secure communication channel through Discourse. Improper escaping of encrypted topic titles could lead to a cross site scripting (XSS) issue when a site has content security policy (CSP) headers disabled. Having CSP disabled is a non-default configuration, and having it disabled with discourse-encrypt installed will result in a warning in the Discourse admin dashboard. This has been fixed in commit `9c75810af9` which is included in the latest version of the discourse-encrypt plugin. Users are advised to upgrade. Users unable to upgrade should ensure that CSP headers are enabled and properly configured.

CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse-encrypt
CVE-2023-41043

Discourse DoS via SvgSprite cache

Discourse is an open-source discussion platform. Prior to version 3.1.1 of the `stable` branch and version 3.2.0.beta1 of the `beta` and `tests-passed` branches, a malicious admin could create extremely large icons sprites, which would then be cached in each server process. This may cause server processes to be killed and lead to downtime. The issue is patched in version 3.1.1 of the `stable` branch and version 3.2.0.beta1 of the `beta` and `tests-passed` branches. This is only a concern for multisite installations. No action is required when the admins are trusted.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-41042

Discourse DoS via remote theme assets

Discourse is an open-source discussion platform. Prior to version 3.1.1 of the `stable` branch and version 3.2.0.beta1 of the `beta` and `tests-passed` branches, importing a remote theme loads their assets into memory without enforcing limits for file size or number of files. The issue is patched in version 3.1.1 of the `stable` branch and version 3.2.0.beta1 of the `beta` and `tests-passed` branches. There are no known workarounds.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-40588

Discourse DoS via 2FA and Security Key Names

Discourse is an open-source discussion platform. Prior to version 3.1.1 of the `stable` branch and version 3.2.0.beta1 of the `beta` and `tests-passed` branches, a malicious user could add a 2FA or security key with a carefully crafted name to their account and cause a denial of service for other users. The issue is patched in version 3.1.1 of the `stable` branch and version 3.2.0.beta1 of the `beta` and `tests-passed` branches. There are no known workarounds.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-38706

Discourse vulnerable to DoS via drafts

Discourse is an open-source discussion platform. Prior to version 3.1.1 of the `stable` branch and version 3.2.0.beta1 of the `beta` and `tests-passed` branches, a malicious user can create an unlimited number of drafts with very long draft keys which may end up exhausting the resources on the server. The issue is patched in version 3.1.1 of the `stable` branch and version 3.2.0.beta1 of the `beta` and `tests-passed` branches. There are no known workarounds.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse
CVE-2023-38685

Discourse's restricted tag information visible to unauthenticated users

Discourse is an open source discussion platform. Prior to version 3.0.6 of the `stable` branch and version 3.1.0.beta7 of the `beta` and `tests-passed` branches, information about restricted-visibility topic tags could be obtained by unauthorized users. The issue is patched in version 3.0.6 of the `stable` branch and version 3.1.0.beta7 of the `beta` and `tests-passed` branches.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Discourse
Products
Discourse