CVE-2023-2490Network attack vector

Administrator-level stored XSS via unsanitized plugin settings

Published May 11, 2023 · Updated Apr 28, 2026

Stored XSS in Fernando Briano UserAgent-Spy 1.3.1 and earlier allows remote authenticated users to inject scripts through plugin settings. Plugin settings are stored without sufficient input sanitization and later rendered without adequate output escaping. Administrator-level access is required, and execution occurs when another user opens an injected page; exposure is limited to multisite installations or sites with unfiltered_html disabled.

CVSS severity4.8
Medium
EPSS probability0.37%
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 Fernando Briano UserAgent-Spy 1.3.1 and earlier allows remote authenticated users to inject scripts through plugin settings. Plugin settings are stored without sufficient input sanitization and later rendered without adequate output escaping. Administrator-level access is required, and execution occurs when another user opens an injected page; exposure is limited to multisite installations or sites with unfiltered_html disabled.

The record

CVE
CVE-2023-2490
Published
May 11, 2023
Updated
Apr 28, 2026
Vendor
Fernando Briano
Product
UserAgent-Spy
Classifications
CWE-79, CAPEC-592
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 11, 2023CVE 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=n/a <=1.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Fernando Briano · UserAgent-Spyversion=n/a <=1.3.1

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.4WordfenceCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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