CVE-2026-55850 Element Web: A malicious homeserver can inject HTML in Element Web using its homepage

Element Web is a Matrix web client built using the Matrix React SDK. Prior to 1.12.22, EmbeddedPage in apps/web/src/components/structures/EmbeddedPage.tsx renders homeserver-supplied homepage content through dangerouslySetInnerHTML without passing it through sanitizedHtmlNode. A malicious...

CVE-2026-55850 Element Web: A malicious homeserver can inject HTML in Element Web using its homepage

Element Web is a Matrix web client built using the Matrix React SDK. Prior to 1.12.22, EmbeddedPage in apps/web/src/components/structures/EmbeddedPage.tsx renders homeserver-supplied homepage content through dangerouslySetInnerHTML without passing it through sanitizedHtmlNode. A malicious...

CVE-2026-55850 Element Web: A malicious homeserver can inject HTML in Element Web using its homepage

Element Web is a Matrix web client built using the Matrix React SDK. Prior to 1.12.22, EmbeddedPage in apps/web/src/components/structures/EmbeddedPage.tsx renders homeserver-supplied homepage content through dangerouslySetInnerHTML without passing it through sanitizedHtmlNode. A malicious...

CVE-2026-55850

Element Web (a Matrix web client) prior to 1.12.22 is vulnerable to HTML injection via the EmbeddedPage component (apps/web/src/components/structures/EmbeddedPage.tsx). The component renders homeserver-supplied homepage content through dangerouslySetInnerHTML without passing it through sanitizedH...

CVE-2026-35163

OctoPrint (a web interface for controlling 3D printers) is affected by a cross-site scripting (XSS) vulnerability in its Suppressed Command notification popups . The root cause is that printer-controlled payload.command and payload.message values in terminal.js are rendered via PNotify without HT...

PT-2026-79846

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, an unauthenticated attacker could send a single request with a crafted color scheme id or dark scheme id cookie to inject arbitrary HTML into a Discourse page. Because the cookie value was render...

CVE-2026-69237: Improper Neutralization of Input During Web Page Generation

There is an HTML injection vulnerability in Esri Portal for ArcGIS versions 11.3 and prior that allows a remote attacker with administrative privileges to insert arbitrary HTML into an administrative API. Users working with ArcGIS Enterprise 11.1, and 11.3 are encouraged to patch. All users are...

CVE-2026-69229: Improper Neutralization of Input During Web Page Generation

There is an HTML injection vulnerability in Esri Portal for ArcGIS versions 12.0 and prior that allows a remote, authenticated attacker to insert arbitrary HTML into the Portal for ArcGIS Home application. Users working with ArcGIS Enterprise 11.1, 11.3, 11.5 and 12.0 are encouraged to patch. All...

PT-2026-79465

Name of the Vulnerable Software and Affected Versions Esri Portal for ArcGIS versions prior to 12.1 Description An HTML injection flaw allows a remote, authenticated attacker to insert arbitrary HTML into the Portal for ArcGIS Home application. HTML injection is a technique where an attacker...

PT-2026-79470

Name of the Vulnerable Software and Affected Versions Esri Portal for ArcGIS versions prior to 11.3 Description An HTML injection issue exists that allows a remote attacker with administrative privileges to insert arbitrary HTML into an administrative API. HTML injection is a technique where an...

PT-2026-79471

Name of the Vulnerable Software and Affected Versions Esri Portal for ArcGIS versions prior to 11.6 Description A remote, highly privileged attacker can insert arbitrary HTML into the Portal for ArcGIS Home application. HTML injection is a process where an attacker injects malicious HTML code int...

PT-2026-79427

Name of the Vulnerable Software and Affected Versions DiscordChatExporter versions prior to 2.47.2 Description The VisitEmojiAsync function in DiscordChatExporter.Core/Exporting/HtmlMarkdownVisitor.cs fails to perform HTML entity encoding when interpolating emoji.Name into the alt attribute and...

PT-2026-79446

Name of the Vulnerable Software and Affected Versions Defuddle versions prior to 0.19.1 Description Site extractors interpolate page-derived image alt and src values, og:image values, and video descriptions into HTML strings without context-appropriate escaping. Additionally, the...

Linux Distros Unpatched Vulnerability : CVE-2026-73254

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can create a file with an HTML payload in its name can trigger stored...

CVE-2026-54682: Improper Neutralization of Input During Web Page Generation

DiscordChatExporter saves Discord chat logs to a file. Prior to 2.47.2, HTML exports generated with markdown formatting disabled pass attacker-controlled content through FormatMarkdownAsync and FormatEmbedMarkdownAsync in DiscordChatExporter.Core/Exporting/MessageGroupTemplate.cshtml and render i...

CVE-2026-54681: Improper Neutralization of Input During Web Page Generation

DiscordChatExporter saves Discord chat logs to a file. Prior to 2.47.2, the VisitEmojiAsync method in DiscordChatExporter.Core/Exporting/HtmlMarkdownVisitor.cs interpolates emoji.Name into the alt attribute and emoji.Code into the title attribute without HTML entity encoding. This affects HTML...

PT-2026-79493

LeafWiki is a self-hosted wiki. Prior to version 0.10.2, page titles returned by the search API could be rendered as raw HTML in the frontend. A user with editor or administrator permissions could create or modify a page title containing an HTML/JavaScript payload. When another user searched for ...

CVE-2026-69238: Improper Neutralization of Input During Web Page Generation

There is an HTML injection vulnerability in Esri Portal for ArcGIS versions 11.5 and prior that allows a remote, highly priviliged attacker to insert arbitrary HTML into the Portal for ArcGIS Home application. Users working with ArcGIS Enterprise 11.1, 11.3, and 11.5 are encouraged to patch. All...

CVE-2026-54505 TREK: Stored cross-user HTML injection via trip title in the Journey suggestion banner

TREK is a collaborative travel planner. Prior to 3.1.0, when the Journey add-on is enabled, TREK interpolates the unescaped activeSuggestion.title value into journey.frontpage.suggestionText through client/src/i18n/TranslationContext.tsx and renders the result with dangerouslySetInnerHTML in...

CVE-2026-54505 TREK: Stored cross-user HTML injection via trip title in the Journey suggestion banner

TREK is a collaborative travel planner. Prior to 3.1.0, when the Journey add-on is enabled, TREK interpolates the unescaped activeSuggestion.title value into journey.frontpage.suggestionText through client/src/i18n/TranslationContext.tsx and renders the result with dangerouslySetInnerHTML in...