Cross-site Scripting (XSS)

Overview showdown is a JavaScript Markdown to HTML converter. Affected versions of this package are vulnerable to Cross-site Scripting XSS in metadata title handling, which inserts markdown frontmatter metadata into the HTML element without escaping the less-than and greater-than characters. An...

showdown metadata title handling allows cross-site scripting

showdown contains a cross-site scripting vulnerability in metadata title handling that allows attackers to inject arbitrary HTML and JavaScript. When completeHTMLDocument option is enabled, unescaped less-than and greater-than characters in markdown frontmatter metadata are inserted directly into...

CVE-2026-59711

CVE-2026-59711 affects the showdown library. A cross-site scripting vulnerability exists in metadata title handling when the completeHTMLDocument option is enabled; unescaped characters in markdown frontmatter metadata are placed into HTML title tags, allowing script execution in the rendered pa...

K000161993: Golang vulnerability CVE-2025-47912

Security Advisory Description The Parse function permits values other than IPv6 addresses to be included in square brackets within the host component of a URL. RFC 3986 permits IPv6 addresses to be included within the host component, enclosed within square brackets. For example: "http://::1/". IP...

CVE-2026-49851 Mistune: Potential DoS via quadratic-time parsing in parse_link_text

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Mistune is vulnerable to a CPU exhaustion DoS due to superlinear approximately On² behavior in parselinktext. When parsing Markdown containing many consecutive characters, parselinktext repeatedly scans the input usin...

CVE-2026-42260

Open-WebSearch is a multi-engine MCP server, CLI, and local daemon for agent web search and content retrieval. Prior to 2.1.7, isPublicHttpUrl / assertPublicHttpUrl in src/utils/urlSafety.ts do not recognize bracketed IPv6 literals and do not resolve DNS, which combine to allow non-blind SSRF wit...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: golang (UTSA-2026-016817)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-016817 advisory. The Parse function permits values other than IPv6 addresses to be included in square brackets within the host component of a URL. RFC 3986 permits IPv6 addresses to ...

CVE-2026-41661 Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion

Admidio is an open-source user management solution. Prior to version 5.0.9, an unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msgwindow.php. The endpoint passes user input through htmlspecialchars, which does not encode...

CVE-2026-41661 Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion

Admidio is an open-source user management solution. Prior to version 5.0.9, an unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msgwindow.php. The endpoint passes user input through htmlspecialchars, which does not encode...

CVE-2026-41661 Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion

Admidio is an open-source user management solution. Prior to version 5.0.9, an unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msgwindow.php. The endpoint passes user input through htmlspecialchars, which does not encode...

GHSA-GQ27-FC8W-VCMP Admidio vulnerable to reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion

Summary An unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msgwindow.php. The endpoint passes user input through htmlspecialchars, which does not encode square brackets. A subsequent call to Language::prepareTextPlaceholder...

Admidio vulnerable to reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion

Summary An unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msgwindow.php. The endpoint passes user input through htmlspecialchars, which does not encode square brackets. A subsequent call to Language::prepareTextPlaceholder...

Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: python3 (UTSA-2026-014321)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-014321 advisory. The Python standard library functions urllib.parse.urlsplit and urlparse accepted domain names that included square brackets which isn't valid according to RFC 3986...

Security Bulletin: IBM Watson Speech Services Cartridge is vulnerable to incorrect parse function values in net/url (CVE-2025-47912)

Summary IBM Watson Speech Services Cartridge is vulnerable to a condition in net/url that allows incorrect parse function values other than IPv6 addresses to be included in square brackets within the host component of a URL CVE-2025-47912, Net/url is used in our speech-utilities. This...

net/url: Insufficient validation of bracketed IPv6 hostnames in net/url

The Parse function permits values other than IPv6 addresses to be included in square brackets within the host component of a URL. RFC 3986 permits IPv6 addresses to be included within the host component, enclosed within square brackets. For example: "http://::1/". IPv4 addresses and hostnames mus...

CVE-2026-39361 OpenObserve has a SSRF Protection Bypass via IPv6 Bracket Notation in validate_enrichment_url

OpenObserve is a cloud-native observability platform. In 0.70.3 and earlier, the validateenrichmenturl function in src/handler/http/request/enrichmenttable/mod.rs fails to block IPv6 addresses because Rust's url crate returns them with surrounding brackets e.g. "::1" not "::1". An authenticated...

CVE-2026-39361

OpenObserve (cloud-native observability platform)

CVE-2026-33672

Picomatch is a glob matcher written JavaScript. Versions prior to 4.0.4, 3.0.2, and 2.3.2 are vulnerable to a method injection vulnerability affecting the POSIXREGEXSOURCE object. Because the object inherits from Object.prototype, specially crafted POSIX bracket expressions e.g., :constructor: ca...

CVE-2026-33672 Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching

Picomatch is a glob matcher written JavaScript. Versions prior to 4.0.4, 3.0.2, and 2.3.2 are vulnerable to a method injection vulnerability affecting the POSIXREGEXSOURCE object. Because the object inherits from Object.prototype, specially crafted POSIX bracket expressions e.g., :constructor: ca...

CVE-2026-3475

The Instant Popup Builder plugin for WordPress is vulnerable to Unauthenticated Arbitrary Shortcode Execution in all versions up to and including 1.1.7. This is due to the handleemailverificationpage function constructing a shortcode string from user-supplied GET parameters token, email and passi...