CVE-2026-13176Network attack vector

Blind server-side requests via unvalidated webhook URLs

Published Aug 21, 2026 · Updated Aug 21, 2026

Server-side request forgery in ThemeWinter Eventin before 4.1.21 allows remote authenticated users to trigger blind requests to arbitrary hosts. Event webhook handling accepts a user-supplied destination URL and initiates the request without validating the URL or confirming ownership of the referenced event. Contributor-level access is sufficient, and the documented consequence is limited to making the WordPress host contact an attacker-chosen destination.

CVSS severity2.7
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in ThemeWinter Eventin before 4.1.21 allows remote authenticated users to trigger blind requests to arbitrary hosts. Event webhook handling accepts a user-supplied destination URL and initiates the request without validating the URL or confirming ownership of the referenced event. Contributor-level access is sufficient, and the documented consequence is limited to making the WordPress host contact an attacker-chosen destination.

The record

CVE
CVE-2026-13176
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
ThemeWinter
Product
Eventin
Classifications
CWE-918
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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 <4.1.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ThemeWinter · Eventinversion=0 <4.1.21

Published CVSS scores

2.7WPScanCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

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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