CVE-2026-75331Network attack vector

Stored XSS via unrestricted HTML uploads

Published Aug 26, 2026 · Updated Aug 26, 2026

Stored XSS in tamguo 1.5.3 allows remote attackers to upload executable HTML or JavaScript through two file-upload endpoints. The /uploadFile and /imgUpload handlers in FileUploadController.java and UEditorController.java store uploads without validating file types. The record does not disclose the authentication gate; script execution occurs after a browser loads a stored upload, within the origin serving that file.

CVSS severity5.4
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in tamguo 1.5.3 allows remote attackers to upload executable HTML or JavaScript through two file-upload endpoints. The /uploadFile and /imgUpload handlers in FileUploadController.java and UEditorController.java store uploads without validating file types. The record does not disclose the authentication gate; script execution occurs after a browser loads a stored upload, within the origin serving that file.

The record

CVE
CVE-2026-75331
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1204.002
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4TenableCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5TenableAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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