HTML injection in the Canarytoken Google Chat notification

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Summary

CVECVE-2026-12888
StatePUBLISHED
AssignerThinkstAppliedResearch
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-22 14:16:34 UTC
Updated2026-06-23 15:42:44 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v4.0 2 LOW from 0f2be0ad-3469-4e56-b38f-4eb96719b425

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:X/V:X/RE:L/U:Green

EPSS: 0.002860000 probability, percentile 0.203290000 (date 2026-06-28)

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

VersionSourceTypeScoreSeverityVector
4.00f2be0ad-3469-4e56-b38f-4eb96719b425Secondary2LOWCVSS: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/C...
4.0CNACVSS2LOWCVSS: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/A...

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Active
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
Low
Sub Availability
None

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:X/V:X/RE:L/U:Green

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Thinkst Applied Research Canarytokens affected sha-4aef1db90 sha-8ab4dccd custom Not specified
CNA Thinkst Applied Research Canarytokens affected 4aef1db90 8ab4dccd git Not specified

References

ReferenceSourceLinkTags
github.com/thinkst/canarytokens/security/advisories/GHSA-vcfc-7466-8q65 0f2be0ad-3469-4e56-b38f-4eb96719b425 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: GitHub.com/geo-chen (en)

Additional Advisory Data

Solutions

CNA: Pull the latest Docker image: $ docker pull thinkst/canarytokens:latest

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