CVE-2026-77088 justhtml 0.9.0 through 1.21.0 Cross-Site Scripting via code-span

justhtml versions 0.9.0 through 1.21.0 contain a cross-site scripting vulnerability in tomarkdown where inline code spans fail to account for blank lines as block boundaries. Attackers can inject blank lines into code or pre element text to break the inline span, causing sanitized HTML to be...

CVE-2026-77088

justhtml versions 0.9.0 through 1.21.0 are affected by a cross-site scripting (XSS) vulnerability in the to_markdown() function. The root cause is that inline code spans fail to treat blank lines as block boundaries. An attacker can inject blank lines into or element text to break the inline sp...

CVE-2026-77088 justhtml 0.9.0 through 1.21.0 Cross-Site Scripting via code-span

justhtml versions 0.9.0 through 1.21.0 contain a cross-site scripting vulnerability in tomarkdown where inline code spans fail to account for blank lines as block boundaries. Attackers can inject blank lines into code or pre element text to break the inline span, causing sanitized HTML to be...

CVE-2026-77088 justhtml 0.9.0 through 1.21.0 Cross-Site Scripting via code-span

justhtml versions 0.9.0 through 1.21.0 contain a cross-site scripting vulnerability in tomarkdown where inline code spans fail to account for blank lines as block boundaries. Attackers can inject blank lines into code or pre element text to break the inline span, causing sanitized HTML to be...

CVE-2026-5389 justhtml before 1.13.0 XSS via code fence breakout

justhtml versions before 1.13.0 contain a cross-site scripting vulnerability in the tomarkdown function when serializing attacker-controlled pre content. Attackers can place backticks inside sanitized pre elements to break out of fixed-length code fences, allowing raw HTML to execute when the...

CVE-2026-5388 justhtml before 1.15.0 Multiple Security Issues

justhtml before 1.15.0 contains multiple security issues in URL sanitization helpers cleanurlvalue/cleanurlinjsstring, HTML serialization, Markdown passthrough htmlpassthrough=True, and several custom sanitization-policy edge cases. Depending on configuration, an attacker can bypass sanitization ...

CVE-2026-5389

justhtml versions before 1.13.0 are affected by a cross-site scripting (XSS) vulnerability in the to_markdown() function. The root cause is that attacker-controlled content inside sanitized elements can contain backticks that break out of fixed-length code fences. When the resulting Markdown is ...

CVE-2026-5388 justhtml before 1.15.0 Multiple Security Issues

justhtml before 1.15.0 contains multiple security issues in URL sanitization helpers cleanurlvalue/cleanurlinjsstring, HTML serialization, Markdown passthrough htmlpassthrough=True, and several custom sanitization-policy edge cases. Depending on configuration, an attacker can bypass sanitization ...

EUVD-2026-64652

justhtml before 1.15.0 contains multiple security issues in URL sanitization helpers cleanurlvalue/cleanurlinjsstring, HTML serialization, Markdown passthrough htmlpassthrough=True, and several custom sanitization-policy edge cases. Depending on configuration, an attacker can bypass sanitization ...

EUVD-2026-64653

justhtml versions before 1.13.0 contain a cross-site scripting vulnerability in the tomarkdown function when serializing attacker-controlled pre content. Attackers can place backticks inside sanitized pre elements to break out of fixed-length code fences, allowing raw HTML to execute when the...

CVE-2026-5388

justhtml (Python HTML sanitizer library) before 1.15.0 contains multiple sanitization bypass vulnerabilities across URL sanitization helpers, HTML serialization, Markdown passthrough, and custom policy edge cases. Attackers can inject active HTML and JavaScript via vectors such as encoded javascr...

PT-2026-79769

justhtml before 1.15.0 contains multiple security issues in URL sanitization helpers clean url value/clean url in js string, HTML serialization, Markdown passthrough html passthrough=True, and several custom sanitization-policy edge cases. Depending on configuration, an attacker can bypass...

PT-2026-79776

justhtml versions are preserved, so untrusted input that is safe in to html — including entity-decoded text e.g. script or text from RCDATA/RAWTEXT-parsed elements like , , , and — can be emitted as raw HTML in the Markdown output, enabling a sanitizer bypass and potential cross-site scripting wh...

CVE-2026-54682 DiscordChatExporter: Stored XSS in HTML export when markdown formatting is disabled

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...

EUVD-2026-64047

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-2026-54682 DiscordChatExporter: Stored XSS in HTML export when markdown formatting is disabled

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...

linkify-it: linkify-it: Denial of Service via algorithmic complexity vulnerability

A flaw was found in linkify-it, a library for recognizing links with full Unicode support. The LinkifyIt.prototype.match function, the package's primary public API, has an algorithmic complexity of ON² for inputs containing many fuzzy links or emails. This can be exploited by a remote attacker...

CVE-2026-73220

CVAT is an open source interactive video and image annotation tool for computer vision. From 2.68.0 until 2.70.0, the audio-task annotation guide renderer in cvat-ui/src/audio/components/annotation-page/audio-workspace/top-bar/audio-right-group.tsx passes attacker-controlled guide Markdown to...

JetBrains IntelliJ IDEA < 2026.2.1 Multiple Vulnerabilities

The version of JetBrains IntelliJ IDEA installed on the remote host is prior to 2026.2.1. It is, therefore, affected by multiple vulnerabilities: - In JetBrains IntelliJ IDEA before 2026.2.1 RCE via Markdown export tool was possible. CVE-2026-75056 - In JetBrains IntelliJ IDEA before 2026.2.1 SSR...

CVE-2026-54743

Lemmy is a link aggregator and forum for the fediverse. Prior to lemmy-ui 0.19.19-beta.1, LemmyNet/lemmy-ui renders Markdown in src/shared/markdown.ts for post bodies, comment bodies, private messages, and community and site sidebars through mdToHtml, which returns a raw html object that Inferno...