CVE-2026-13424 (GCVE-0-2026-13424)
Vulnerability from cvelistv5 – Published: 2026-08-16 06:38 – Updated: 2026-08-16 06:38
VLAI
EPSS
VEX
Title
Online Scheduling and Appointment Booking System <= 27.7 - Unauthenticated Stored Cross-Site Scripting via bookly_speed_up_update_addons AJAX action
Summary
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Stored Cross-Site Scripting via bookly_speed_up_update_addons AJAX action in all versions up to, and including, 27.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injection point is the bookly_speed_up_update_addons AJAX action, which is registered as wp_ajax_nopriv_* and therefore reachable without authentication; the payload is stored verbatim in the bookly_log.details column when a request is submitted without a valid signature, and executes when an administrator later views the Diagnostics → Logs page.
Severity
7.2 (High)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
10 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ladela | Online Scheduling and Appointment Booking System – Bookly |
Affected:
0 , ≤ 27.7
(semver)
|
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"product": "Online Scheduling and Appointment Booking System \u2013 Bookly",
"vendor": "ladela",
"versions": [
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"version": "0",
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}
],
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"problemTypes": [
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"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/cfb53e44-7f9d-490f-b938-f428c20219d7?source=cve"
},
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},
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},
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"url": "https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/27.7/backend/modules/diagnostics/Ajax.php#L344"
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"url": "https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/27.5/lib/PluginsUpdater.php#L97"
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"url": "https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/27.5/lib/PluginsUpdater.php#L13"
},
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"url": "https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/27.5/backend/modules/diagnostics/Ajax.php#L344"
},
{
"url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026old=3637918%40bookly-responsive-appointment-booking-tool\u0026new=3637918%40bookly-responsive-appointment-booking-tool"
}
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"timeline": [
{
"lang": "en",
"time": "2026-06-26T13:19:37.000Z",
"value": "Vendor Notified"
},
{
"lang": "en",
"time": "2026-08-15T17:53:44.000Z",
"value": "Disclosed"
}
],
"title": "Online Scheduling and Appointment Booking System \u003c= 27.7 - Unauthenticated Stored Cross-Site Scripting via bookly_speed_up_update_addons AJAX action"
}
},
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"datePublished": "2026-08-16T06:38:08.903Z",
"dateReserved": "2026-06-26T13:04:17.882Z",
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"state": "PUBLISHED"
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"date": "2026-08-16",
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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