CVE-2026-11859 HTML injection in the Canarytoken links email
Attackers can inject HTML into Canarytoken notification emails, enabling XSS in email clients that render HTML content.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-11859?
CVE-2026-11859 is a low-severity cross-site scripting vulnerability in Thinkst Applied Research Canarytokens, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-74
Which versions are affected by CVE-2026-11859?
How do I fix CVE-2026-11859?
No fix has been published for CVE-2026-11859 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-11859 being exploited?
There is no known exploitation of CVE-2026-11859 in the wild and no public exploit code.
Sources
Also known as GHSA-55jf-cqr9-r7p4.