CVE-2026-53907Network attack vector

Stored XSS via executable SVG logo upload

Published Jul 1, 2026 · Updated Jul 1, 2026

Stored XSS in MyComplianceOffice MCO 25.3.3.1 allows remote authenticated users to execute JavaScript via a crafted SVG logo upload. The application logo upload function accepts and stores SVG files containing active script, which runs when the logo is rendered or opened. Changing the application logo requires high privileges, and the demonstrated impact is script execution in another user’s browser context.

CVSS severity4.8
Medium
EPSS probability0.24%
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 MyComplianceOffice MCO 25.3.3.1 allows remote authenticated users to execute JavaScript via a crafted SVG logo upload. The application logo upload function accepts and stores SVG files containing active script, which runs when the logo is rendered or opened. Changing the application logo requires high privileges, and the demonstrated impact is script execution in another user’s browser context.

The record

CVE
CVE-2026-53907
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
MyComplianceOffice
Product
MCO
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=25.3.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

MyComplianceOffice · MCOversion=25.3.3.1

Published CVSS scores

4.8CERT.PLCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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