CVE-2026-28170Network attack vector

Stored script execution via unescaped User-Agent header

Published Aug 13, 2026 · Updated Aug 13, 2026

Stored cross-site scripting in Blog Floating Button 1.4.20 and earlier allows remote attackers to execute script in an administrator's browser. The plugin stores the visitor User-Agent header from an unauthenticated tracking REST endpoint and renders it without sanitizing or escaping it in the access analytics report. Exploitation requires an administrator to open that report, where the payload executes with the administrator's WordPress session and can enable site takeover.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Blog Floating Button 1.4.20 and earlier allows remote attackers to execute script in an administrator's browser. The plugin stores the visitor User-Agent header from an unauthenticated tracking REST endpoint and renders it without sanitizing or escaping it in the access analytics report. Exploitation requires an administrator to open that report, where the payload executes with the administrator's WordPress session and can enable site takeover.

The record

CVE
CVE-2026-28170
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Meril Inc.
Product
Blog Floating Button
Classifications
CWE-79, CAPEC-592, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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 <=1.4.20 changes=[{"at":"1.4.21","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meril Inc. · Blog Floating Buttonversion=n/a <=1.4.20 changes=[{"at":"1.4.21","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-592Stored XSS
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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