CVE-2026-12888 PUBLISHED

HTML injection in the Canarytoken Google Chat notification

Assigner: ThinkstAppliedResearch
Reserved: 22.06.2026 Published: 22.06.2026 Updated: 22.06.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:P/AU:N/RE:L/U:Green
CVSS Score: 2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	Low
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Active

CVSS 4.0

Product Status

Vendor	Thinkst Applied Research
Product	Canarytokens
Versions	Default: unaffected affected from sha-4aef1db90 to sha-8ab4dccd (excl.) affected from 4aef1db90 to 8ab4dccd (excl.)

Solutions

Pull the latest Docker image:

$ docker pull thinkst/canarytokens:latest

Credits

GitHub.com/geo-chen finder

References

https://github.com/thinkst/canarytokens/security/advisories/GHSA-vcfc-7466-8q65

Problem Types

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE

Impacts

CAPEC-113 Interface Manipulation