CVE-2021-24530Public exploitNetwork attack vector

Stored XSS via unsanitized Custom CSS

Published Sep 20, 2021 · Updated Aug 3, 2024

Stored XSS in Alojapro Booking Engine 1.1.15 and earlier allows remote authenticated users to execute script through Custom CSS. The WordPress plugin stores Custom CSS without properly sanitizing it, then exposes the injected markup in pages viewed by other users. High-privilege access to the setting is required, and the script runs in a victim's browser in the affected site's context even when unfiltered_html is disabled.

CVSS severity4.8
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Alojapro Booking Engine 1.1.15 and earlier allows remote authenticated users to execute script through Custom CSS. The WordPress plugin stores Custom CSS without properly sanitizing it, then exposes the injected markup in pages viewed by other users. High-privilege access to the setting is required, and the script runs in a victim's browser in the affected site's context even when unfiltered_html is disabled.

The record

CVE
CVE-2021-24530
Published
Sep 20, 2021
Updated
Aug 3, 2024
Vendor
Alojapro
Product
Alojapro Booking Engine
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=1.1.15 <=1.1.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Alojapro · Alojapro Booking Engineversion=1.1.15 <=1.1.15

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.5WordfenceCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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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