Security Vulnerabilities
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, several webhook endpoints (SendGrid, Mailjet, Mandrill, Postmark, SparkPost) in the `WebhooksController` accepted requests without a valid authentication token when no token was configured. This allowed unauthenticated attackers to forge webhook payloads and artificially inflate user bounce scores, potentially causing legitimate user emails to be disabled. The Mailpace endpoint had no token validation at all. Starting in versions 2025.12.2, 2026.1.1, and 2026.2.0, all webhook endpoints reject requests with a 406 response when no authentication token is configured. As a workaround, ensure that webhook authentication tokens are configured for all email provider integrations in site settings (e.g., `sendgrid_verification_key`, `mailjet_webhook_token`, `postmark_webhook_token`, `sparkpost_webhook_token`). There's no current workaround for mailpace before getting this fix.
CVSS Score
6.5
EPSS Score
0.001
Published
2026-02-26
Reflected Cross-Site Scripting (XSS) on the A3factura web platform, in parameter 'customerName', in 'a3factura-app.wolterskluwer.es/#/incomes/salesInvoices' endpoint, which could allow an attacker to execute arbitrary code in the victim's browser.
CVSS Score
6.1
EPSS Score
0.0
Published
2026-02-26
Reflected Cross-Site Scripting (XSS) on the A3factura web platform, in parameter 'customerVATNumber', in 'a3factura-app.wolterskluwer.es/#/incomes/salesDeliveryNotes' endpoint, which could allow an attacker to execute arbitrary code in the victim's browser.
CVSS Score
6.1
EPSS Score
0.0
Published
2026-02-26
Reflected Cross-Site Scripting (XSS) on the A3factura web platform, in parameter 'name', in 'a3factura-app.wolterskluwer.es/#/incomes/representatives-management' endpoint, which could allow an attacker to execute arbitrary code in the victim's browser.
CVSS Score
6.1
EPSS Score
0.0
Published
2026-02-26
Reflected Cross-Site Scripting (XSS) on the A3factura web platform, in parameter 'name', parameter 'name', in 'a3factura-app.wolterskluwer.es/#/incomes/customers' endpoint, which could allow an attacker to execute arbitrary code in the victim's browser.
CVSS Score
6.1
EPSS Score
0.0
Published
2026-02-26
Improper neutralization of input in Checkmk versions 2.4.0 before 2.4.0p22, and 2.3.0 before 2.3.0p43 allows an attacker that can manipulate a host's check output to inject malicious JavaScript into the Synthetic Monitoring HTML logs, which can then be accessed via a crafted phishing link.
CVSS Score
5.4
EPSS Score
0.0
Published
2026-02-26
An XSS vulnerability affects the OAuth web services used by the WebVue, WebScheduler, TouchVue and SnapVue features of PcVue in version 12.0.0 through 16.3.3 included. It might allow a remote attacker to trick a legitimate user into loading content from another site upon unsuccessful user authentication on an unknown application (unknown client_id).
This vulnerability only affects the error page of the OAuth server.
CVSS Score
6.1
EPSS Score
0.001
Published
2026-02-26
Some HTTP security headers are not properly set by the web server when sending responses to the client application.
CVSS Score
6.1
EPSS Score
0.0
Published
2026-02-26
The Secure and SameSite attribute are missing in the GraphicalData web services and WebClient web app of PcVue in version 12.0.0 through 16.3.3 included.
CVSS Score
6.5
EPSS Score
0.0
Published
2026-02-26
A HTTP Host header attack vulnerability affects WebClient and the WebScheduler web apps of PcVue in version 15.0.0 through 16.3.3 included, allowing a remote attacker to inject harmful payloads that manipulate server-side behavior.
This vulnerability only affects the endpoints /Authentication/ExternalLogin, /Authentication/AuthorizationCodeCallback and /Authentication/Logout
of the WebClient and WebScheduler web apps.
CVSS Score
6.1
EPSS Score
0.001
Published
2026-02-26