CVE-2025-51503Public exploitNetwork attack vector

Admin-browser JavaScript execution via unencoded profile fields

Published Jul 31, 2025 · Updated Jul 31, 2025

Stored XSS in Microweber CMS 2.0.0 through 2.0.19 allows remote authenticated users to execute JavaScript via profile fields. The /microweber/api/user_save endpoint stores first_name and last_name values without adequate sanitization or output encoding, and the admin profile page renders them as executable markup. An account able to edit admin-visible profile fields can persist the payload, which executes when an administrator loads or refreshes the profile page.

CVSS severity7.6
High
EPSS probability0.48%
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 Microweber CMS 2.0.0 through 2.0.19 allows remote authenticated users to execute JavaScript via profile fields. The /microweber/api/user_save endpoint stores first_name and last_name values without adequate sanitization or output encoding, and the admin profile page renders them as executable markup. An account able to edit admin-visible profile fields can persist the payload, which executes when an administrator loads or refreshes the profile page.

The record

CVE
CVE-2025-51503
Published
Jul 31, 2025
Updated
Jul 31, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 31, 2025Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
1.9GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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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