CVE-2026-42754Network attack vector

Reflected XSS via callback response

Published May 27, 2026 · Updated May 27, 2026

Reflected XSS in Favicon by RealFaviconGenerator 1.3.46 and earlier allows remote attackers to execute script via a crafted callback request. Public advisories identify the RealFaviconGenerator callback as the affected locus but do not disclose which callback parameter is reflected or how output encoding fails. Exploitation requires user interaction with an attacker-controlled request, after which script runs in the victim's browser under the WordPress site's origin.

CVSS severity7.1
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Favicon by RealFaviconGenerator 1.3.46 and earlier allows remote attackers to execute script via a crafted callback request. Public advisories identify the RealFaviconGenerator callback as the affected locus but do not disclose which callback parameter is reflected or how output encoding fails. Exploitation requires user interaction with an attacker-controlled request, after which script runs in the victim's browser under the WordPress site's origin.

The record

CVE
CVE-2026-42754
Published
May 27, 2026
Updated
May 27, 2026
Vendor
RealFaviconGenerator
Product
Favicon by RealFaviconGenerator
Classifications
CWE-79, CAPEC-591, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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 <=1.3.46 changes=[{"at":"1.3.47","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RealFaviconGenerator · Favicon by RealFaviconGeneratorversion=0 <=1.3.46 changes=[{"at":"1.3.47","status":"unaffected"}]

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')
CAPEC-591Reflected XSS
T1204.001Malicious Link

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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