CVE-2026-12985 Mattermost DCR redirect URI allowlist bypass via improper URL component validation

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7 Mattermost failed to validate Dynamic Client Registration redirect URIs by URL component matching glob patterns against the raw URI string instead which allows a remote unauthenticated attacker to register an OAuth client with ...

CVE-2026-12985

Mattermost versions 11.9.0 and earlier , 11.8.4 and earlier , and 11.7.7 and earlier contain a flaw in Dynamic Client Registration (DCR) redirect URI validation . The application matches configured glob patterns against the raw URI string rather than individual URL components, allowing a remote u...

CVE-2026-73310

XenForo before 2.3.13 contains an authorization flaw in the OAuth2 token endpoint that allows attackers controlling any allowlisted redirect URI to bypass redirect URI binding by submitting a different allowlisted URI than the one recorded at authorization time. Attackers can then exchange an int...

CVE-2026-86431

league/commonmark thephpleague/commonmark versions = 2.7.0 and 2.9.1 contain a cross-site scripting vulnerability in the AttributesExtension. Prefixing an attribute name with a single U+000C form feed byte e.g. \x0Conclick="alert1" bypasses the AttributesHelper::filterAttributes 'on' event-handle...

PT-2026-86797

league/commonmark thephpleague/commonmark versions = 2.7.0 and 2.9.1 contain a cross-site scripting vulnerability in the AttributesExtension. Prefixing an attribute name with a single U+000C form feed byte e.g. x0Conclick="alert1" bypasses the AttributesHelper::filterAttributes 'on' event-handler...

PT-2026-84035

Name of the Vulnerable Software and Affected Versions Smarty versions prior to 4.5.7 Smarty versions prior to 5.8.2 Description Smarty is a PHP template engine that separates presentation from application logic. A flaw exists in the fetch handling within libs/plugins/function.fetch.php and...

CVE-2026-73563 Backstage: Unauthenticated OAuth account takeover via `redirect_uri` allowlist bypass in `@backstage/plugin-auth-backend`

Backstage is an open framework for building developer portals. Prior to 0.29.2, the experimental dynamic client registration and client ID metadata document features in the @backstage/plugin-auth-backend use full-string matcher.isMatch glob matching for...

EUVD-2026-58177

Backstage is an open framework for building developer portals. Prior to 0.29.2, the experimental dynamic client registration and client ID metadata document features in the @backstage/plugin-auth-backend use full-string matcher.isMatch glob matching for...

PT-2026-71711

Backstage is an open framework for building developer portals. Prior to 0.29.2, the experimental dynamic client registration and client ID metadata document features in the @backstage/plugin-auth-backend use full-string matcher.isMatch glob matching for...

PT-2026-71345

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.25.0 until 2.25.2, Loofah::HTML5::Scrub.allowed uri? does not reject javascript: URIs whose scheme is split or prefixed with the HTML5 named whitespace character...

Improperly Implemented Security Check for Standard

Overview org.keycloak:keycloak-services is an open source identity and access management solution for modern applications and services. Affected versions of this package are vulnerable to Improperly Implemented Security Check for Standard through the secure-client-uris client policy executor in t...

Linux Distros Unpatched Vulnerability : CVE-2026-65912

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - DOMPurify before 3.3.2 contains a URI validation bypass vulnerability when ADDATTR is provided as a predicate function via EXTRAELEMENTHANDLING.attributeCheck...

CVE-2026-65912

DOMPurify before 3.3.2 contains a URI validation bypass vulnerability when ADDATTR is provided as a predicate function via EXTRAELEMENTHANDLING.attributeCheck. Attackers can supply a predicate that accepts specific attribute and tag combinations to bypass URI-safe validation, allowing unsafe...

Incomplete List of Disallowed Inputs

Overview Affected versions of this package are vulnerable to Incomplete List of Disallowed Inputs via improper handling of namespaced or prefixed script elements and case-sensitive matching of JavaScript URIs in the removeScripts plugin. An attacker can execute arbitrary scripts in the context of...

Cross-site Scripting (XSS)

Overview loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Affected versions of this package are vulnerable to Cross-site Scripting XSS in the Loofah::HTML5::Scrub.alloweduri? method, which uses CGI.unescapeHTML and therefore...

Important: Red Hat Security Advisory: OpenShift Container Platform 4.22.3 security and extras update

Red Hat OpenShift Container Platform release 4.22.3 is now available with updates to packages and images that fix several bugs. This release includes a security update for Red Hat OpenShift Container Platform 4.22. Red Hat Product Security has rated this update as having a security impact of...

keycloak: Keycloak: Cross-site scripting (XSS) via case-insensitive URI validation bypass

A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with manage-client permission or access to client registration endpoints, could bypass client Uniform Resource Identifier URI validation. This is achieved by registering a malicious client with a...

CVE-2026-50090

Technical details about CVE-2026-50090 are not publicly available in the provided documents. Monitor for updates from official advisories to learn affected components, impact, and fixes.

DEBIAN-CVE-2026-41417

Netty allows request-line validation to be bypassed when a DefaultHttpRequest or DefaultFullHttpRequest is created first and its URI is later changed via setUri. The constructors reject CRLF and whitespace characters that would break the start-line, but setUri does not apply the same validation...

CVE-2026-4296: Incorrect Regular Expression

An incorrect regular expression vulnerability was identified in GitHub Enterprise Server that allowed an attacker to bypass OAuth redirect URI validation. An attacker with knowledge of a first-party OAuth application's registered callback URL could craft a malicious authorization link that, when...