CVE-2026-12888 HTML injection in the Canarytoken Google Chat notification
Attackers can inject HTML into Google Chat notifications, enabling interface manipulation and potential phishing via inserted links.
- 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-2026-12888?
CVE-2026-12888 is a low-severity cross-site scripting vulnerability in Thinkst Applied Research Canarytokens, published on 22 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 exists in the Google Chat webhook notification sent by Thinkst Applied Research Canarytokens, enabling Interface Manipulation in Google Chat. An attacker can insert limited HTML content including links.
This issue affects Canarytokens: from Docker tag sha-4aef1db90 before sha-8ab4dccd, from Git commit 4aef1db90 before 8ab4dccd.
Weakness: CWE-74
Which versions are affected by CVE-2026-12888?
How do I fix CVE-2026-12888?
No fix has been published for CVE-2026-12888 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-2026-12888 being exploited?
There is no known exploitation of CVE-2026-12888 in the wild and no public exploit code.
Sources
Also known as GHSA-vcfc-7466-8q65.