CVE-2026-11859: HTML injection in the Canarytoken links email

Severity: low (CVSS 2.0 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-10 · updated 2026-10-26
Weakness: CWE-74

Description

An HTML injection vulnerability in the "fetch links" email sent by Thinkst Applied Research Canarytokens, enabling Interface Manipulation, Cross-Site Scripting (XSS) in emails clients that render HTML emails. This issue affects Canarytokens: from Docker tag sha-c0f3cf142 before sha-08c3f93d, from Git commit c0f3cf142 before 08c3f93d.

Affected products

Thinkst Applied Research Canarytokens: from sha-c0f3cf142 before sha-08c3f93d — fixed in sha-08c3f93d

How to fix

Upgrade to a fixed version: Thinkst Applied Research Canarytokens sha-08c3f93d. Check the vendor advisory for mitigations.

References

https://github.com/thinkst/canarytokens/security/advisories/GHSA-55jf-cqr9-r7p4

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