CVE-2024-13521Network attack vector

Stored XSS via nonce-free settings update

Published Jan 28, 2025 · Updated Apr 8, 2026

Cross-site request forgery in MailUp Auto Subscription 1.1.0 and earlier allows remote attackers to store malicious scripts in settings. The mas_options function accepts attacker-controlled settings updates without correctly validating a request nonce. A site administrator must submit the forged request, after which the stored script content can execute in an administrative browser context.

CVSS severity6.1
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in MailUp Auto Subscription 1.1.0 and earlier allows remote attackers to store malicious scripts in settings. The mas_options function accepts attacker-controlled settings updates without correctly validating a request nonce. A site administrator must submit the forged request, after which the stored script content can execute in an administrative browser context.

The record

CVE
CVE-2024-13521
Published
Jan 28, 2025
Updated
Apr 8, 2026
Vendor
ilGhera
Product
MailUp Auto Subscription
Classifications
CWE-352, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=1.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ilGhera · MailUp Auto Subscriptionversion=0 <=1.1.0

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
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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