A vulnerability was found in IdentityServer3 up to 2.4.x/2.5.x/2.6.0. It has been classified as problematic. Affected is an unknown function of the component Angular Expression Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on confidentiality. CVE summarizes:

IdentityServer3 2.4.x, 2.5.x, and 2.6.x before 2.6.1 has XSS in an Angular expression on the authorize response page, which might allow remote attackers to obtain sensitive information about the IdentityServer authorization response.

The bug was discovered 08/07/2017. The weakness was published 08/08/2017 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2017-12677 since 08/07/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 2.6.1 eliminates this vulnerability.

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• IdentityServer3

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• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6

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