thinkst canarytokens up to 2019-03-01 Title cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in thinkst canarytokens. This affects an unknown function. Such manipulation of the argument Title leads to cross site scripting. This vulnerability is traded as CVE-2026-28355. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in thinkst canarytokens and classified as problematic. Affected by this issue is some unknown functionality. The manipulation of the argument title with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

Canarytokens help track activity and actions on a network. Versions prior to `sha-7ff0e12` have a Self Cross-Site Scripting vulnerability in the "PWA" Canarytoken, whereby the Canarytoken's creator can attack themselves or someone they share the link with. The creator of a PWA Canarytoken can insert Javascript into the title field of their PWA token. When the creator later browses the installation page for their own Canarytoken, the Javascript executes. This is a self-XSS. An attacker could create a Canarytoken with this self-XSS, and send the install link to a victim. When they click on it, the Javascript would execute. However, no sensitive information (ex. session information) will be disclosed to the malicious actor. This issue is now patched on Canarytokens.org. Users of self-hosted Canarytokens installations can update by pulling the latest Docker image, or any Docker image after sha-7ff0e12.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-28355 since 02/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version sha-7ff0e12 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-9072). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• thinkst

Name

• canarytokens

Version

• 2019-03-01

Website

• Product: https://github.com/thinkst/canarytokens/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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