Cyber Resilience

CVE-2026-48768

Critical

Published: 18 June 2026

Published
18 June 2026
Modified
22 June 2026
KEV Added
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Patch
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CVSS Score v3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
EPSS Score 0.0027 18.5th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-48768 is a critical-severity Path Traversal (CWE-22) vulnerability. Its CVSS base score is 9.3 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 18.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access ControlA05:2025 Injection

EU & UK References

Vulnerability details

TypeBot is a chatbot builder tool. In versions 3.16.1 and earlier, POST /api/blocks/file-input/v3/generate-upload-url is unauthenticated and uses unsanitized fileName input to construct public/ S3 object keys, while issuing presigned PUT URLs that do not bind Content-Type. As a result, any…

more

anonymous visitor to a published bot with a file input can upload attacker-controlled HTML, SVG, or JS to attacker-chosen subpaths, including other tenants’ publicly served result paths, enabling arbitrary content hosting and potential stored XSS on the storage origin. ../ traversal is blocked by S3/MinIO canonicalization (signature mismatch), but forward-slash path injection is exploitable. This issue has been fixed in version 3.17.0.

CWE(s)
CWE-22CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1608.001 Upload Malware Resource Development
Adversaries may upload malware to third-party or adversary controlled infrastructure to make it accessible during targeting.
attack.mitre.org →
T1608.004 Drive-by Target Resource Development
Adversaries may prepare an operational environment to infect systems that visit a website over the normal course of browsing.
attack.mitre.org →
Why these techniques?

Unauthenticated public API endpoint (T1190) directly abused for arbitrary malicious file upload to public storage paths, enabling staging of malware/content (T1608.001) and drive-by targets (T1608.004) with stored XSS potential.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

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In
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-10 Information Input Validation
addresses: CWE-22 CWE-79

Validates pathnames and filenames to prevent traversal outside intended directories.

CA-8 Penetration Testing
addresses: CWE-79

Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.

SI-15 Information Output Filtering
addresses: CWE-79

Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.

References