CVE-2026-5306Public exploitNetwork attack vector

Stored XSS via unsafe email replacement

Published Apr 28, 2026 · Updated Apr 28, 2026

Stored XSS in Magazine3 Check & Log Email before 2.0.13 allows remote attackers to inject JavaScript through a crafted post comment. With Email Encoder enabled, email replacement transforms attacker-controlled mailto content without safely neutralizing HTML attributes, leaving event-handler markup executable. An administrator must enable Email Encoder and view the pending comment; the payload then executes during moderation and again on approved content.

CVSS severity5.4
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Magazine3 Check & Log Email before 2.0.13 allows remote attackers to inject JavaScript through a crafted post comment. With Email Encoder enabled, email replacement transforms attacker-controlled mailto content without safely neutralizing HTML attributes, leaving event-handler markup executable. An administrator must enable Email Encoder and view the pending comment; the payload then executes during moderation and again on approved content.

The record

CVE
CVE-2026-5306
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
Backup For WP
Product
Check & Log Email
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.0.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Backup For WP · Check & Log Emailversion=0 <2.0.13

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-79Cross-Site Scripting (XSS)
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo