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tamguo CVE-2026-75331

| EUVDEUVD-2026-66801 MEDIUM
Unrestricted Upload of File with Dangerous Type (CWE-434)
2026-08-26 mitre GHSA-g8c8-m4x5-p2mp
4.6
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
4.6 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
vuln.today AI
4.6 MEDIUM

PR:L confirmed by authenticated upload requirement; UI:R required as victim must load the stored file; no availability impact applies.

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

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Analysis Generated
Aug 27, 2026 - 18:35 vuln.today
CVSS changed
Aug 27, 2026 - 17:22 NVD
4.6 (MEDIUM)
CVE Published
Aug 26, 2026 - 00:00 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

tamguo 1.5.3 is vulnerable to Unrestricted File Upload Leading to Stored XSS. The /uploadFile and /imgUpload endpoints in FileUploadController.java and UEditorController.java have no file type validation. Attackers can upload arbitrary HTML/JavaScript files to the server.

AnalysisAI

Stored XSS via unrestricted file upload in tamguo 1.5.3 allows authenticated network attackers to execute arbitrary JavaScript in victims' browsers. The /uploadFile and /imgUpload endpoints in FileUploadController.java and UEditorController.java accept arbitrary HTML and JavaScript files without content-type or extension validation, enabling persistent script injection. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with low-privilege account
Delivery
Upload malicious HTML/JS file via /uploadFile or /imgUpload
Exploit
Obtain stored file URL
Execution
Deliver URL to privileged victim via phishing
Persist
Victim browser loads and executes payload
Impact
Steal session cookies or credentials

Vulnerability AssessmentAI

Exploitation Exploitation requires a valid low-privilege authenticated session (PR:L from CVSS vector) - unauthenticated access to the upload endpoints is not indicated. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 score of 4.6 (Medium) with vector AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N accurately reflects the constrained real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a low-privilege account on tamguo 1.5.3 uploads a file named payload.html containing a JavaScript cookie-stealing script via the /imgUpload endpoint. The attacker then sends a crafted link to the stored file to an administrator or higher-privileged user; when the victim opens the link in their browser, the script executes in the application's origin context, exfiltrating session cookies or credentials to an attacker-controlled server. …
Remediation No vendor-released patch has been identified at time of analysis; no official advisory with a fixed version was found in any of the referenced sources. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-75331 vulnerability details – vuln.today

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