--- title: "TYPO3-CORE-SA-2018-001: Authentication Bypass in TYPO3 CMS" url: "https://news.typo3.com/security/advisory/typo3-core-sa-2018-001" description: It has been discovered, that TYPO3 CMS is vulnerable to Authentication Bypass. image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg" date: 2026-06-11 modified: 2026-06-11 categories: - "Developer & Technology" - TYPO3 CMS --- # TYPO3-CORE-SA-2018-001: Authentication Bypass in TYPO3 CMS - [Developer & Technology](https://news.typo3.com/article/category/developer-technology) - Security / [TYPO3 CMS](https://news.typo3.com/article/category/security/typo3-cms) TYPO3-CORE-SA-2018-001: Authentication Bypass in TYPO3 CMS ========================================================== 12 July 2018 ![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 TYPO3 CMS is vulnerable to Authentication Bypass. - ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/b8266fdc667b773926c59081862ab148.jpeg)[Oliver Hader](https://news.typo3.com/article/author/oliver-hader) - **Component Type:** TYPO3 CMS - **Vulnerable subcomponent:** Salted Passwords (ext:saltedpasswords) - **Release Date:** July 12, 2018 - **Vulnerability Type:** Authentication Bypass - **Affected Versions:** 7.0.0 to 7.6.29, 8.0.0 to 8.7.16 and 9.0.0 to 9.3.0 - **Severity:** None - Critical (depending on the default hashing algorithm) - **Suggested CVSS v2.0:** [AV:N/AC:M/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C/CDP:ND/TD:L/CR:ND/IR:ND/AR:ND](https://nvd.nist.gov/vuln-metrics/cvss/v2-calculator?vector=(AV:N/AC:M/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C/CDP:ND/TD:L/CR:ND/IR:ND/AR:ND)) - **CVE:** not assigned yet ### Problem Description It has been discovered that TYPO3’s Salted Password system extension (which is a mandatory system component) is vulnerable to Authentication Bypass when using hashing methods which are related by PHP class inheritance. In standard TYPO3 core distributions stored passwords using the blowfish hashing algorithm can be overridden when using MD5 as the default hashing algorithm by just knowing a valid username. Per default the Portable PHP hashing algorithm (PHPass) is used which is not vulnerable. ### Solution Update to TYPO3 versions 7.6.30, 8.7.17 or 9.3.1 that fix the problem described. ### Credits Thanks to TYPO3 core team member Oliver Hader  who reported and fixed the issue. ### General Advice Follow the recommendations that are given in the [TYPO3 Security Guide](https://docs.typo3.org/typo3cms/SecurityGuide/). Please subscribe to the [typo3-announce](http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce) mailing list. ### General Note All security related code changes are tagged so that you can easily look them up in our [review system](https://review.typo3.org/#/q/status:merged+project:Packages/TYPO3.CMS+topic:security,n,z). ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/cc7cba9757f98fbe05023a139119df74.jpeg) About the Author [Oliver Hader](https://news.typo3.com/article/author/oliver-hader) Core Developer at TYPO3 GmbH,Hof, Germany [Website](https://typo3.com)[Twitter](https://twitter.com/ohader)[LinkedIn](https://www.linkedin.com/in/oliverhader/)[Xing](https://www.xing.com/profile/Oliver_Hader) Oliver started to work with TYPO3 in 2005 and was fascinated by the product and its universe. Since 2007 he is member of the TYPO3 Core Team. After going back to university in 2014 for achieving a postgraduate master degree in internet web science, he is now researching on advanced web technology topics in general and for TYPO3 in particular. In his spare time, Oliver loves to go cycling cross-country in the uplands around Hof (Germany) in northern Bavaria - at the region where he's living as well. [More posts by this author](https://news.typo3.com/article/author/oliver-hader)