CVE-2026-39620Network attack vector

Web-shell upload via forged file request

Published Apr 8, 2026 · Updated Apr 8, 2026

Cross-site request forgery in Webriti Appointment 3.5.5 and earlier allows remote attackers to upload a web shell through a forged request. Patchstack has not published the affected function or the missing request-validation check that permits the attacker-controlled upload. Exploitation requires a user with sufficient upload authority to interact with attacker-controlled content, enabling code execution on the WordPress server.

CVSS severity9.6
Critical
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 Webriti Appointment 3.5.5 and earlier allows remote attackers to upload a web shell through a forged request. Patchstack has not published the affected function or the missing request-validation check that permits the attacker-controlled upload. Exploitation requires a user with sufficient upload authority to interact with attacker-controlled content, enabling code execution on the WordPress server.

The record

CVE
CVE-2026-39620
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
Webriti
Product
Appointment
Classifications
CWE-352, CAPEC-650, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2026CVE 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 <=3.5.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Webriti · Appointmentversion=0 <=3.5.5

Published CVSS scores

9.6PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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)
CAPEC-650Upload a Web Shell to a Web Server
T1190Exploit Public-Facing Application

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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