--- title: "TYPO3-EXT-SA-2015-001: Improper Authentication in LDAP / SSO Authentication (ig_ldap_sso_auth)" url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2015-001" description: "It has been discovered that the extension \"LDAP / SSO Authentication\" (ig_ldap_sso_auth) is susceptible to Improper Authentication." image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg" date: 2026-06-11 modified: 2026-06-11 categories: - TYPO3 Extensions --- # TYPO3-EXT-SA-2015-001: Improper Authentication in LDAP / SSO Authentication (ig_ldap_sso_auth) - Security / [TYPO3 Extensions](https://news.typo3.com/article/category/security/typo3-extensions) TYPO3-EXT-SA-2015-001: Improper Authentication in LDAP / SSO Authentication (ig\_ldap\_sso\_auth) ================================================================================================= 08 January 2015 ![A laptop screen displaying a list of security advisories](https://news.typo3.com/typo3temp/assets/_processed_/d/c/csm_security_blog_default_77f8e86036.webp) It has been discovered that the extension "LDAP / SSO Authentication" (ig\_ldap\_sso\_auth) is susceptible to Improper Authentication. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/bbf959d8e683550c90ae922aff9145d8.jpeg)[Marcus Krause](https://news.typo3.com/article/author/marcus-krause) **Release Date:** January 8, 2015 **Bulletin Update:** January 8, 2015 (Affected Versions, Severity); February 23, 2015 (added CVE) **Component Type:** Third party extension. This extension is not a part of the TYPO3 default installation. **Affected Versions:** 2.0.0 **Vulnerability Type:** Improper Authentication **Severity:** Critical **Suggested CVSS v2.0:** AV:N/AC:L/Au:N/C:P/I:P/A:N/E:F/RL:OF/RC:C **CVE:** CVE-2015-1401 **Problem Description:** The extension insufficiently authenticates an user against LDAP/AD. **Solution:** Updated version 2.0.1 is available from the TYPO3 extension manager and at [http://typo3.org/extensions/repository/download/ig\_ldap\_sso\_auth/2.0.1/t3x/](http://typo3.org/extensions/repository/download/ig_ldap_sso_auth/2.0.1/t3x/ "Opens external link in new window"). **Credits:** Credits go to Stefan Kaifer who discovered the vulnerability. **General advice:** Follow the recommendations that are given in the [TYPO3 Security Guide](http://docs.typo3.org/typo3cms/SecurityGuide/ "Initiates file download"). Please subscribe to the [typo3-announce mailing list](http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce "Opens external link in new window") to receive future Security Bulletins via E-mail. ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/b5c88386e5b1d8fca79d0652427922d2.jpeg) About the Author [Marcus Krause](https://news.typo3.com/article/author/marcus-krause) [More posts by this author](https://news.typo3.com/article/author/marcus-krause)