CVE-2023-49839Network attack vector

Unauthenticated reflected script execution

Published Mar 26, 2024 · Updated Apr 28, 2026

Reflected cross-site scripting in six KlbTheme WordPress core plugins allows remote attackers to execute scripts through crafted requests. Patchstack has not published the affected endpoint or the input returned to the page without adequate neutralization. Exploitation requires a user to follow a crafted link or visit a crafted page, allowing script execution in that user's browser context.

CVSS severity7.1
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in six KlbTheme WordPress core plugins allows remote attackers to execute scripts through crafted requests. Patchstack has not published the affected endpoint or the input returned to the page without adequate neutralization. Exploitation requires a user to follow a crafted link or visit a crafted page, allowing script execution in that user's browser context.

The record

CVE
CVE-2023-49839
Published
Mar 26, 2024
Updated
Apr 28, 2026
Vendor
KlbTheme
Product
Furnob Core
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 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=n/a <=1.1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

KlbTheme · Furnob Coreversion=n/a <=1.1.7
KlbTheme · Partdo Coreversion=n/a <=1.0.9
KlbTheme · Medibazar Coreversion=n/a <=1.2.3
KlbTheme · Cosmetsy Coreversion=n/a <=1.3.0
KlbTheme · Bacola Coreversion=n/a <=1.3.3
KlbTheme · Clotya Coreversion=n/a <=1.1.5

Published CVSS scores

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')
T1203Exploitation for Client Execution

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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