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Canarytokens CVE-2026-12888

| EUVDEUVD-2026-38240 LOW
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (CWE-74)
2026-06-22 ThinkstAppliedResearch
Google Code Injection Docker Canarytokens
2.0
CVSS 4.0 · Vendor: ThinkstAppliedResearch

Severity by source

Vendor (ThinkstAppliedResearch) PRIMARY
2.0 LOW
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
vuln.today AI
4.7 MEDIUM

Network-triggered, no privileges needed to fire a token, but active user interaction is required to view the injected Chat message; scope changes to the Google Chat subsequent system with low integrity impact only.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

Primary rating from Vendor (ThinkstAppliedResearch).

CVSS VectorVendor: ThinkstAppliedResearch

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

2
Patch available
Jun 22, 2026 - 15:02 EUVD
Analysis Generated
Jun 22, 2026 - 14:42 vuln.today

DescriptionCVE.org

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.

AnalysisAI

HTML injection in Canarytokens' Google Chat webhook notifications allows an attacker who triggers a deployed canarytoken to embed limited HTML content - including crafted hyperlinks - inside the resulting alert message rendered in Google Chat. The vulnerable system is Canarytokens itself (Docker tag sha-4aef1db90 through sha-8ab4dccd), but the integrity impact lands on the subsequent system: the Google Chat interface where defenders receive their alerts. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Trigger deployed canarytoken remotely
Delivery
Inject crafted HTML into token-activation metadata
Exploit
Canarytokens sends unsanitised webhook payload to Google Chat
Execution
Google Chat renders injected HTML in alert message
Persist
Defender clicks malicious link in security alert
Impact
Defender redirected to attacker-controlled phishing page
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target Canarytokens deployment has the Google Chat webhook notification channel configured and active - instances not using Google Chat webhooks are not affected by this specific injection path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 2.0 accurately reflects the very constrained real-world impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker discovers or infers that a target organisation is using Canarytokens and intentionally triggers a deployed token - for example, by accessing a honeyfile or visiting a URL token. The attacker controls metadata injected into the trigger (such as a crafted User-Agent or referring URL) that gets embedded in the Google Chat webhook notification without sanitisation. …
Remediation Upstream fix available via Git commit sha-8ab4dccd; a formally released and independently versioned patched build is not confirmed from available data - only the fix commit boundary is identified. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-12888 vulnerability details – vuln.today
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