Vendor
Discourse
323 known vulnerabilities.
Products
323 results · Feed
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Medium 6.3
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 vulnerabil…
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Low 3.1
Discourse secure uploads accessible to guests even when login is required
Discourse is a platform for community discussion. Under very specific circumstances, secure upload URLs associated with posts can be accessed by guest users even when login is required. This vulnerability has been patched in 3.2.0.beta4 and 3.1.4.
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Medium 4.3
Insufficient control of custom field value sizes
Discourse is a platform for community discussion. For fields that are client editable, limits on sizes are not imposed. This allows a malicious actor to cause a Discourse instance to use excessive disk space and also often excessive bandwidth. The issue is pa…
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Low 3.5
Reaction data for user notifications exposed in Discourse-reactions
Discourse-reactions is a plugin that allows user to add their reactions to the post. Data about a user's reaction notifications could be exposed. This vulnerability was patched in commit 2c26939.
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High 8.6
Discourse vulnerable to unlimited mentioned users in message serializer
Discourse is a platform for community discussion. The message serializer uses the full list of expanded chat mentions (@all and @here) which can lead to a very long array of users. This issue was patched in versions 3.1.4 and beta 3.2.0.beta5.
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Low 3.4
Discourse SSRF vulnerability in Embedding
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, the embedding feature is susceptible to server side request forgery. The issue is p…
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High 7.5
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 …
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Medium 5.3CVE-2023-47119 Public exploit
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. …
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Medium 4.3
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, a…
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Low 3.3
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 …
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Medium 4.3CVE-2023-45806 Public exploit
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 …
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High 8.0
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 …
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High 7.5CVE-2023-45131 Public exploit
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…
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Medium 5.3
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. Use…
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High 7.5
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 ver…
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Low 3.7
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 partic…
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High 8.0
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 …
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Medium 4.9
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.…
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Medium 4.1
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_verb…
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High 7.2
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 C…
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Medium 6.5
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 …
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Medium 4.9
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…
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Medium 6.5
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 a…
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Medium 6.5
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…
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Medium 4.3
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 i…
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Medium 5.3
Discourse vulnerable to ossible DDoS due to unbounded limits in various controller actions
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, in multiple controller actions, Discourse accepts limit params but does not impose any upper boun…
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Medium 4.3
Discourse vulnerable to DoS via defer queue
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, a malicious user can prevent the defer queue from proceeding promptly on sites hosted in the same…
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Medium 4.3
Discourse vulnerable to DoS via post edit reason
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, a malicious user can edit a post in a topic and cause a DoS with a carefully crafted edit reason.…
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Low 2.6
Discourse Race Condition in Accept Invite
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, more users than permitted could be created from invite links. The issue is patched in version 3.0…
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Medium 6.8
Discourse CSP nonce reuse vulnerability for anonymous users
Discourse is an open source discussion platform. Prior to version 3.1.0.beta7 of the `beta` and `tests-passed` branches, a CSP (Content Security Policy) nonce reuse vulnerability was discovered could allow cross-site scripting (XSS) attacks to bypass CSP prot…
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Medium 6.5
Denial of service via User Custom Sidebar Section Unlimited Link Creation in discourse
Discourse is an open source discussion platform. In affected versions a request to create or update custom sidebar section can cause a denial of service. This issue has been patched in commit `52b003d915`. Users are advised to upgrade. There are no known work…
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Low 3.5
Topic Title Validation Skipped When Changing Category in Discourse
Discourse is an open source discussion platform. When editing a topic, there is a vulnerability that enables a user to bypass the topic title validations for things like title length, number of emojis in title and blank topic titles. The issue is patched in t…
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Medium 6.8
CSP nonce reuse vulnerability in Discourse
Discourse is an open source discussion platform. A CSP (Content Security Policy) nonce reuse vulnerability could allow XSS attacks to bypass CSP protection. There are no known XSS vectors at the moment, but should one be discovered, this vulnerability would a…
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Medium 4.8
Discourse vulnerable to exposure of number of topics recently created in private categories
Discourse is an open source discussion platform. Prior to version 3.0.4 of the `stable` branch and version 3.1.0.beta5 of the `beta` and `tests-passed` branches, an attacker could use the new topics dismissal endpoint to reveal the number of topics recently c…
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Low 3.1
Discourse's canonical url not being used for topic embeddings
Discourse is an open source discussion platform. Prior to version 3.0.4 of the `stable` branch and version 3.1.0.beta5 of the `beta` and `tests-passed` branches, multiple duplicate topics could be created if topic embedding is enabled. This issue is patched i…
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Medium 5.4
Discourse Topic Creation Page Allows iFrame Tag without Restrictions
Discourse is an open source discussion platform. Prior to version 3.0.4 of the `stable` branch and version 3.1.0.beta5 of the `beta` and `tests-passed` branches, the lack of restrictions on the iFrame tag makes it easy for an attacker to exploit the vulnerabi…
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Low 2.0
Discourse's general category permissions could be set back to default
Discourse is an open source discussion platform. Prior to version 3.0.4 of the `stable` branch and version 3.1.0.beta5 of the `beta` and `tests-passed` branches, if a site has modified their general category permissions, they could be set back to the default.…
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Medium 4.3
Reaction metadata exposed in private topics in Discourse-reactions
Discourse-reactions is a plugin that allows user to add their reactions to the post in the Discourse messaging platform. In affected versions data about what reactions were performed on a post in a private topic could be leaked. This issue has been addressed …
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Medium 4.2
Multisite denial of service through unsanitized dynamic dispatch to SiteSetting in Discourse
Discourse is an open source platform for community discussion. In affected versions a user logged as an administrator can call arbitrary methods on the `SiteSetting` class, notably `#clear_cache!` and `#notify_changed!`, which when done on a multisite instanc…
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Medium 5.4
Stored Cross-site Scripting via improper sanitization of svg files in Discourse
Discourse is an open source platform for community discussion. Due to the improper sanitization of SVG files, an attacker can execute arbitrary JavaScript on the users’ browsers by uploading a crafted SVG file. This issue is patched in the latest stable and t…