EUVD-2026-38736Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/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:X/R:X/V:X/RE:X/U:X
Requires low-privilege auth (PR:L), knowledge of a random identifier (AC:H), and victim page visit (UI:R); stored XSS crosses into victim browser scope (S:C) with limited confidentiality and integrity impact.
Primary rating from Vendor (ThinkstAppliedResearch).
CVSS VectorVendor: ThinkstAppliedResearch
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/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:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
1DescriptionCVE.org
Stored Cross-Site Scripting in the exposed AWS API key store of Thinkst Applied Research Canarytokens.
Anonymous exploitation requires knowledge of a random identifier.
This issue affects Canarytokens: from Docker tag sha-4116b92cb before sha-f5aa5c4e, from Git commit 4116b92cb before f5aa5c4e.
AnalysisAI
Stored XSS in the AWS API key store component of Thinkst Applied Research Canarytokens allows a low-privileged attacker who knows a token's random identifier to inject persistent malicious scripts that execute in a victim's browser when they view the affected token page. Exploitation is constrained by high attack complexity (AC:H), a prerequisite attack requirement (knowledge of a random identifier), low-privilege authentication, and active user interaction - reflected in an extremely low CVSS 4.0 base score of 1.1. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) the attacker holds at least low-privilege authenticated access (PR:L) to the self-hosted Canarytokens web interface - unauthenticated exploitation is not supported per CVSS PR:L; (2) the attacker possesses or can obtain the specific random identifier associated with the target AWS API key token - the CVE description explicitly states 'anonymous exploitation requires knowledge of a random identifier', making this a hard prerequisite; (3) a victim user with sufficient privileges must actively view the affected token management page (UI:A); (4) the deployment must be a self-hosted Docker or Git-based instance running commits in the vulnerable range. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is very low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker authenticated to a self-hosted Canarytokens instance and in possession of a target token's random identifier modifies the AWS API key store field with a crafted XSS payload, which is persisted to the backend. When a legitimate user (e.g., a security operator or admin) navigates to the token management page for that token, the stored script executes in their browser session, potentially exfiltrating session tokens or performing actions on behalf of the victim. … |
| Remediation | Update the self-hosted Docker deployment to image tag sha-f5aa5c4e or any later commit in the Thinkst canarytokens repository - this is the confirmed upstream fix per the vendor security advisory at https://github.com/thinkst/canarytokens/security/advisories/GHSA-23pf-xjp2-48q6. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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