CVE-2023-50905Network attack vector

Unauthenticated script execution via unsanitized User-Agent logging

Published Feb 29, 2024 · Updated Apr 28, 2026

Stored XSS in Melapress WP Activity Log 4.6.1 and earlier allows remote attackers to execute scripts through a crafted User-Agent header. The activity-log display path stores the HTTP User-Agent value and renders it without sufficient input sanitization or output escaping. The payload runs in an administrator's browser when the injected log entry is viewed, exposing browser-accessible data and actions in that session.

CVSS severity7.1
High
EPSS probability0.33%
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 Melapress WP Activity Log 4.6.1 and earlier allows remote attackers to execute scripts through a crafted User-Agent header. The activity-log display path stores the HTTP User-Agent value and renders it without sufficient input sanitization or output escaping. The payload runs in an administrator's browser when the injected log entry is viewed, exposing browser-accessible data and actions in that session.

The record

CVE
CVE-2023-50905
Published
Feb 29, 2024
Updated
Apr 28, 2026
Vendor
Melapress
Product
WP Activity Log
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=0 <=4.6.1
  2. Affected versionversion=n/a <=4.6.1 changes=[{"at":"4.6.2","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Melapress · WP Activity Logversion=0 <=4.6.1; version=n/a <=4.6.1 changes=[{"at":"4.6.2","status":"unaffected"}]

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007JavaScript/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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