FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)

Summary Stored XSS is possible via share metadata fields e.g., title, description that are rendered into HTML for /public/share/ without context-aware escaping. The server uses text/template instead of html/template, allowing injected scripts to execute when victims visit the share URL. Details T...

GHSA-8WHX-V8QQ-PQ64 changedetection.io has Reflected XSS in its RSS Tag Error Response

A reflected cross-site scripting XSS vulnerability was identified in the /rss/tag/ endpoint of changedetection.io. The taguuid path parameter is reflected directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser...

GHSA-QGVG-PR8V-6RR3 Svelte: XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers

Errors from transformError were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from transformError...

CVE-2026-27645

changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, the RSS single-watch endpoint reflects the UUID path parameter directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the...

Cross-site Scripting (XSS)

Overview changedetection.io is a Website change detection and monitoring service Affected versions of this package are vulnerable to Cross-site Scripting XSS via the rss/ endpoint, where the UUID path parameter is reflected in the HTTP response body without proper HTML escaping. An attacker can...

GHSA-9FWW-8CPR-Q66R Isso affected by Stored XSS via comment website field

Impact This is a stored Cross-Site Scripting XSS vulnerability affecting the website and author comment fields. The website field was HTML-escaped using quote=False, which left single and double quotes unescaped. Since the frontend inserts the website value directly into a single-quoted href...

CVE-2026-27120

Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character a...

PT-2026-21366

Name of the Vulnerable Software and Affected Versions Isso versions prior to 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144 Description Isso, a lightweight commenting server written in Python and JavaScript, contains a stored Cross-Site Scripting XSS issue. The website and author comment fields are...

CVE-2026-27120

Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character a...

CVE-2026-27120

Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character a...

CVE-2026-27120 Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character a...

CVE-2026-27120

Leaf-kit (templating library for Swift) before version 1.4.1 is vulnerable to HTML escaping bypass via extended grapheme clusters in htmlEscaped(), enabling potential XSS in attribute contexts when user-controlled variables are interpolated. The root cause is that htmlEscaped escapes only when th...

CVE-2026-27120 Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character a...

Improper Neutralization of Equivalent Special Elements

Overview vapor/leaf-kit is an an expressive, performant, and extensible templating language built for Swift. Affected versions of this package are vulnerable to Improper Neutralization of Equivalent Special Elements in the htmlEscaped function. An attacker can inject malicious HTML or JavaScript...

Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

Summary htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this c...

GHSA-4HFH-FCH3-5Q7P Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

Summary htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this c...

PT-2026-20982

Name of the Vulnerable Software and Affected Versions Leafkit versions prior to 1.4.1 Description Leafkit’s htmlEscaped function inadequately escapes HTML special characters when dealing with extended grapheme clusters. This occurs because the function only escapes characters if the extended...

Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead ...

Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead ...

GHSA-FQX6-693C-F55G LibreNMS has a Stored XSS in Custom OID - unit parameter missing strip_tags()

Summary The unit parameter in Custom OID functionality lacks striptags sanitization while other fields name, oid, datatype are sanitized. The unsanitized value is stored in the database and rendered without HTML escaping, allowing Stored XSS. Details Vulnerable Input Processing...