CVE-2026-81900 Concrete CMS before 9.5.3 is vulnerable to Stored XSS in the YouTube block (vWidth/vHeight)

Concrete CMS before 9.5.3 applied only trim to the YouTube block's stored width and height values and printed them into iframe HTML attributes without escaping or integer casting, resulting in stored cross-site scripting. A user with editblock permission could inject an event handler that execute...

CVE-2026-81900 Concrete CMS before 9.5.3 is vulnerable to Stored XSS in the YouTube block (vWidth/vHeight)

Concrete CMS before 9.5.3 applied only trim to the YouTube block's stored width and height values and printed them into iframe HTML attributes without escaping or integer casting, resulting in stored cross-site scripting. A user with editblock permission could inject an event handler that execute...

Astra Linux – Vulnerability in Firefox and Thunderbird

An iframe from a cross-origin origin that references an XSLT document would inherit the permissions of the parent domain such as access to microphones or cameras. This vulnerability affects Thunderbird 102.2, Thunderbird 91.13, Firefox ESR 91.13, Firefox ESR 102.2, and Firefox 104...

Astra Linux – Vulnerability in Firefox and Thunderbird

Dragging a URL from a cross-origin iframe that was removed during the drag-and-drop process could lead to user confusion and website spoofing attacks. This vulnerability affects Firefox 111, Firefox ESR 102.9, and Thunderbird 102.9...

Astra Linux – Vulnerability in WebKit2GTK

A permissions issue has been addressed with additional restrictions. This issue is fixed in Safari 18.4, iOS 18.4, and iPadOS 18.4. Loading a malicious iframe may lead to a cross-site scripting attack...

Astra Linux – Vulnerability in Firefox and Thunderbird

When navigating from within an iframe while requesting fullscreen access, a tab controlled by an attacker could prevent the browser from exiting fullscreen mode. This vulnerability affects Firefox ESR 91.5, Firefox 96, and Thunderbird 91.5...

Astra Linux – Vulnerability in Chromium

Insufficient policy enforcement in the iFrameSandbox of Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions through a crafted HTML page...

Astra Linux – Vulnerability in Chromium

Insufficient policy enforcement in PopupBlocker in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted iframe...

Astra Linux – Vulnerability in Firefox and Thunderbird

It was possible to create specific XSLT markup that could bypass the iframe sandbox. This vulnerability affects Firefox ESR versions prior to 91.5, Firefox versions prior to 96, and Thunderbird versions prior to 91.5...

Astra Linux – Vulnerability in Firefox and Thunderbird

During iframe navigation, certain pages did not have their FeaturePolicy fully initialized, resulting in a bypass that allowed device permissions to be leaked into untrusted sub-documents. This vulnerability affects Firefox ESR 102.3, Thunderbird 102.3, and Firefox 105...

Astra Linux – Vulnerability in WebKit2GTK

This issue has been addressed through improved enforcement of iframe sandboxing policies. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4, and iPadOS 14.4. Maliciously crafted web content may violate...

Astra Linux – Vulnerability in Firefox

A nested iframe, which triggers cross-site navigation, may send cookies with the SameSite=Strict or Lax attribute. This vulnerability affects Firefox 128 and Thunderbird 128...

Astra Linux – Vulnerability in Chromium

Inappropriate implementation in the iFrame Sandbox in Google Chrome prior to 95.0.4638.54 allowed a remote attacker to bypass navigation restrictions through a crafted HTML page...

Astra Linux – Vulnerability in Firefox

Even when an iframe was sandboxed with allow-top-navigation-by-user-activation, if it received a redirect header to an external protocol, the browser would process the redirect and prompt the user appropriately. This vulnerability affects Firefox versions earlier than 102...

Astra Linux – Vulnerability in Firefox and Thunderbird

The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox 94, Thunderbird 91.3, and Firefox ESR 91.3...

Astra Linux – Vulnerability in Chromium

Inappropriate implementation in the iframe Sandbox in Google Chrome prior to 109.0.5414.74 allowed a remote attacker to bypass file download restrictions via a crafted HTML page. Chromium security severity: Medium...

Astra Linux – Vulnerability in Firefox and Thunderbird

If an attacker could control the contents of an iframe that was sandboxed using allow-popups but not allow-scripts, they could create a link that, when clicked, would cause JavaScript execution, violating the sandboxing rules. This vulnerability affects Firefox 98, Firefox ESR 91.7, and Thunderbi...

Astra Linux – Vulnerability in Firefox and Thunderbird

When exiting fullscreen mode, an iframe could mislead the browser regarding the current state of fullscreen, potentially causing confusion for users or leading to spoofing attacks. This vulnerability affects Thunderbird 91.10, Firefox 101, and Firefox ESR 91.10...

Astra Linux – Vulnerability in Firefox and Thunderbird

Due to a layout change, the contents of iframes might be rendered outside of their borders. This could lead to user confusion or spoofing attacks. This vulnerability affects Thunderbird 91.8, Firefox 99, and Firefox ESR 91.8...

Astra Linux – Vulnerability in Chromium

Insufficient policy enforcement in the iframe sandbox of Google Chrome prior to version 96.0.4664.45 allowed a remote attacker to bypass navigation restrictions through a crafted HTML page...