An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. XSS can occur via a link on an error page.

An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2. It allows XSS via an uploaded file.

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS could occur via the author_link field of a Slack attachment.

Fixed a bypass for a reflected cross-site scripting vulnerability affecting OAuth-enabled instances of Mattermost.

Mattermost Jira plugin versions shipped with Mattermost versions 8.1.x before 8.1.10, 9.2.x before 9.2.6, 9.3.x before 9.3.2, and 9.4.x before 9.4.3 fail to escape user-controlled outputs when generating HTML pages, which allows an attacker to perform reflected cross-site scripting attacks against the users of the Mattermost server.

Mattermost 5.38 and earlier fails to sufficiently sanitize clipboard contents, which allows a user-assisted attacker to inject arbitrary web script in product deployments that explicitly disable the default CSP.

An issue was discovered in Mattermost Server before 3.1.0. It allows XSS because the noreferrer and noopener protection mechanisms were not in place.

An issue was discovered in Mattermost Server before 3.0.0. It allows XSS via a Legal or Support setting.

An issue was discovered in Mattermost Server before 2.2.0. It allows XSS because it configures files to be opened in a browser window.

An issue was discovered in Mattermost Server before 3.5.1. XSS can occur via file preview.

An issue was discovered in Mattermost Server before 3.0.0. It allows XSS via a redirect URL.

An issue was discovered in Mattermost Server before 2.2.0. It allows XSS via a crafted link.

Mattermost version 8.1.6 and earlier fails to sanitize channel mention data in posts, which allows an attacker to inject markup in the web client.

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS attacks could occur against an OAuth 2.0 allow/deny page.

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. Display names allow XSS.

An issue was discovered in Mattermost Server before 3.6.0 and 3.5.2. XSS can occur via a link on an error page.

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS can occur via OpenGraph data.

A reflected cross-site scripting vulnerability in the OAuth flow completion endpoints in Mattermost allows an attacker to send AJAX requests on behalf of the victim via sharing a crafted link with a malicious state parameter.

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS could occur via the title_link field of a Slack attachment.

An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2. XSS could occur via a channel header.

Mattermost fails to properly check a redirect URL parameter allowing for an open redirect was possible when the user clicked "Back to Mattermost" after providing a invalid custom url scheme in /oauth/{service}/mobile_login?redirect_to=

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. E-mail templates can have a field in which HTML content is not neutralized.

Mattermost Desktop App versions <=5.7.0 fail to correctly prompt for permission when opening external URLs which allows a remote attacker to force a victim over the Internet to run arbitrary programs on the victim's system via custom URI schemes.

An issue was discovered in Mattermost Server before 5.18.0, 5.17.2, 5.16.4, 5.15.4, and 5.9.7. An attacker can spoof a direct-message channel by changing the type of a channel.

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows Phishing because an error page can have a link.

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows an attacker to create a button that, when pressed by a user, launches an API request.

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5, when used as an OAuth 2.0 service provider. It mishandles a deny action for a redirection.

An issue was discovered in Mattermost Desktop App before 4.4.0. Attackers can open web pages in the desktop application because server redirection is mishandled, aka MMSA-2020-0008.

An issue was discovered in Mattermost Server before 2.1.0. It allows XSS via CSRF.

An issue was discovered in Mattermost Server before 3.1.0. It allows XSS via theme color-code values.

Mattermost 6.3.0 and earlier fails to properly sanitize the HTML content in the email invitation sent to guest users, which allows registered users with special permissions to invite guest users to inject unescaped HTML content in the email invitations.

Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.

The Sophos Web Appliance before 4.3.2 has XSS in the FTP redirect page, aka NSWA-1342.

The WP Ajax Contact Form WordPress plugin through 2.2.2 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against admin users

Quectel UC20 UMTS/HSPA+ UC20 6.3.14 is affected by a Cross Site Scripting (XSS) vulnerability.

Rukovoditel before 2.4.1 allows XSS.

Script afGdStream.php in AdmirorFrames Joomla! extension doesn’t specify a content type and as a result default (text/html) is used. An attacker may embed HTML tags directly in image data which is rendered by a webpage as HTML. This issue affects AdmirorFrames: before 5.0.

app/Core/Paginator.php in Kanboard before 1.2.8 has XSS in pagination sorting.

Cross-site scripting (XSS) vulnerability in HP Business Availability Center (BAC) 8.06 and earlier allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Microsoft Exchange Server 2016 allows an elevation of privilege vulnerability when Microsoft Exchange Outlook Web Access (OWA) fails to properly handle web requests, aka "Microsoft Exchange Cross-Site Scripting Vulnerability."

A Cross-Site Scripting (XSS) vulnerability exists in the reorder administrator functions in sNews 1.71.

A Cross Site Scripting vulnerability in CloudClassroom-PHP Project v1.0 allows a remote attacker to execute arbitrary code via the exid parameter of the assessment function.

In Moodle 3.x, XSS can occur via attachments to evidence of prior learning.

Cross site scripting (XSS) vulnerability in the Spiffy Calendar plugin before 3.3.0 for WordPress allows remote attackers to inject arbitrary JavaScript via the yr parameter.

Cross-site scripting (XSS) vulnerability in HP SiteScope 9.54, 10.13, 11.01, and 11.1 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Cross-site scripting (XSS) vulnerability in the Trello app before 4.0.8 for iOS might allow remote attackers to inject arbitrary web script or HTML by uploading and attaching a crafted photo to a Card.

XSS via orig_url exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before fw-b305hw2_380hw6_580hw2_710hw3_1350hw2_2500-7.0.1-build2093. The affected script is guest/preview.cgi.

PHPJabbers Cinema Booking System v2.0 is vulnerable to reflected cross-site scripting (XSS). Multiple endpoints improperly handle user input, allowing malicious scripts to execute in a victim’s browser. Attackers can craft malicious links to steal session cookies or conduct phishing attacks.

Cross-site scripting (XSS) vulnerability in admin/walkthrough/walkthrough.php in the Design Approval System plugin before 3.7 for WordPress allows remote attackers to inject arbitrary web script or HTML via the step parameter.

Reflected Cross-Site Scripting (XSS) vulnerability in dmpop Mejiro Commit Versions Prior To 3096393 allows attackers to run arbitrary code via crafted string in metadata of uploaded images.