#xss

A cross-site scripting (XSS) vulnerability in Grav v1.7.45 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

### Summary There are several sources of arbitrary, unescaped user input being used to construct HTML, which allows any user that can edit pages or otherwise render wikitext to XSS other users. > Edit: Only the first XSS can be reproduced in production. ### Details > ✅ Verified and patched in f229cab099c69006e25d4bad3579954e481dc566 https://github.com/StarCitizenTools/mediawiki-extensions-TabberNeue/blob/2526daa9f8cfdd616c861c8439755cb74a6c8c6e/includes/TabberTransclude.php#L154 This doesn't escape the user-supplied page name when outputting, so an XSS payload as the page name can be used here. This was caused by d8c3db4e5935476e496d979fb01f775d3d3282e6. ---- > ❌ Invalid as MediaWiki parser sanitizes dangerous HTML https://github.com/StarCitizenTools/mediawiki-extensions-TabberNeue/blob/2526daa9f8cfdd616c861c8439755cb74a6c8c6e/includes/Tabber.php#L160 The documentation for [`Parser::recursiveTagParse()`](https://doc.wikimedia.org/mediawiki-core/REL1_42/php/classMediaWiki_1_1Par...

# Bypass XSS sanitizer using the javascript protocol and special characters **Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 5.4 (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) **CVSS vector v.4.0**: 4.8 (AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N) **Description**: an attacker can use special characters, so that the library processes the javascript protocol with special characters and generates an HTML link **Impact**: executing arbitrary JavaScript code in the browser **Vulnerable component**: class `PhpOffice\PhpSpreadsheet\Writer\Html`, method `generateRow` **Exploitation conditions**: a user viewing a specially generated Excel file **Mitigation**: additional sanitization of special characters in a string **Researcher**: Aleksey Solovev (Positive Technologies) # Research The researcher discovered zero-day vulnerability Bypass XSS sanitizer using ...

# Cross-Site Scripting (XSS) vulnerability of the hyperlink base in the HTML page header **Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 5.4 (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) **CVSS vector v.4.0**: 4.8 (AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N) **Description**: the HTML page is formed without sanitizing the hyperlink base **Impact**: executing arbitrary JavaScript code in the browser **Vulnerable component**: class `PhpOffice\PhpSpreadsheet\Writer\Html`, method `generateHTMLHeader` **Exploitation conditions**: a user viewing a specially generated Excel file **Mitigation**: additional sanitization of special characters in a string **Researcher**: Aleksey Solovev (Positive Technologies) # Research The researcher discovered zero-day vulnerability Cross-Site Scripting (XSS) vulnerability of the hyperlink base in the HTML page header in ...

# Cross-Site Scripting (XSS) vulnerability in custom properties **Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 5.4 (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) **CVSS vector v.4.0**: 4.8 (AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N) **Description**: the HTML page is generated without clearing custom properties **Impact**: executing arbitrary JavaScript code in the browser **Vulnerable component**: class `PhpOffice\PhpSpreadsheet\Writer\Html`, method `generateMeta` **Exploitation conditions**: a user viewing a specially generated Excel file **Mitigation**: additional sanitization of special characters in a string **Researcher**: Aleksey Solovev (Positive Technologies) # Research The researcher discovered zero-day vulnerability Cross-Site Scripting (XSS) vulnerability in custom properties in Phpspreadsheet. The following code is written on the ser...

# Unauthorized Reflected XSS in `Currency.php` file **Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 8.2 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N) **CVSS vector v.4.0**: 8.3 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L) **Description**: using the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php` script, an attacker can perform XSS-type attack **Impact**: executing arbitrary JavaScript code in the browser **Vulnerable component**: the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php` file **Exploitation conditions**: an unauthorized user **Mitigation**: sanitization of the `currency` variable **Researcher**: Aleksey Solovev (Positive Technologies) # Research The researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in `Currency.php` file) in Phpspread...

# Unauthorized Reflected XSS in the `Accounting.php` file **Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 8.2 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N) **CVSS vector v.4.0**: 8.3 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L) **Description**: using the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.php` script, an attacker can perform a XSS-type attack **Impact**: executing arbitrary JavaScript code in the browser **Vulnerable component**: the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.php` file **Exploitation conditions**: an unauthorized user **Mitigation**: sanitization of the currency variable **Researcher**: Aleksey Solovev (Positive Technologies) # Research The researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in `Accounting.php` file) ...

# Unauthorized Reflected XSS in the constructor of the `Downloader` class **Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 8.2 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N) **CVSS vector v.4.0**: 8.3 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L) **Description**: using the `/vendor/phpoffice/phpspreadsheet/samples/download.php` script, an attacker can perform a XSS-type attack **Impact**: execution of arbitrary JavaScript code in the browser **Vulnerable component**: the constructor of the `Downloader` class **Exploitation conditions**: an unauthorized user **Mitigation**: sanitization of the `name` and `type` variables **Researcher**: Aleksey Solovev (Positive Technologies) # Research The researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in the constructor of the `Downloader` class) in Phpspreadsheet. ...

The Trix editor, versions prior to 2.1.11, is vulnerable to XSS when pasting malicious code in the link field. ### Impact An attacker could trick the user to copy&paste a malicious `javascript:` URL as a link that would execute arbitrary JavaScript code within the context of the user's session, potentially leading to unauthorized actions being performed or sensitive information being disclosed. See https://gist.github.com/th4s1s/3921fd9c3e324ad9a3e0d846166e3eb8 ### Patches Update Recommendation: Users should upgrade to Trix editor version 2.1.12 or later. ### Workarounds This is not really a workaround but something that should be considered in addition to upgrading to the patched version. If affected users can disallow browsers that don't support a Content Security Policy, then this would be an effective workaround for this and all XSS vulnerabilities. Set CSP policies such as script-src 'self' to ensure that only scripts hosted on the same origin are executed, and explicitly p...

# Unauthorized Reflected XSS in `Convert-Online.php` file **Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 8.2 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N) **CVSS vector v.4.0**: 8.3 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L) **Description**: using the `/vendor/phpoffice/phpspreadsheet/samples/Engineering/Convert-Online.php` script, an attacker can perform a XSS-type attack **Impact**: executing arbitrary JavaScript code in the browser **Vulnerable component**: the `/vendor/phpoffice/phpspreadsheet/samples/Engineering/Convert-Online.php` file **Exploitation conditions**: an unauthorized user **Mitigation**: sanitization of the quantity variable **Researcher**: Aleksey Solovev (Positive Technologies) # Research The researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in `Convert-Online.php` file) in Php...