CVE-2026-44583Network attack vector

Unauthenticated blind SSRF via unvalidated certificate URL

Published Jul 20, 2026 · Updated Jul 20, 2026

SSRF in Paymenter before 1.5.0 allows remote attackers to trigger blind HTTP GET requests through the PayPal webhook endpoint. The endpoint passes the unvalidated PAYPAL-CERT-URL header directly to file_get_contents, which fetches the attacker-selected URL. No authentication or user interaction is required; no response body is returned, but outbound requests can probe internal services or leak data through side channels.

CVSS severity5.3
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Paymenter before 1.5.0 allows remote attackers to trigger blind HTTP GET requests through the PayPal webhook endpoint. The endpoint passes the unvalidated PAYPAL-CERT-URL header directly to file_get_contents, which fetches the attacker-selected URL. No authentication or user interaction is required; no response body is returned, but outbound requests can probe internal services or leak data through side channels.

The record

CVE
CVE-2026-44583
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
Paymenter
Product
Paymenter
Classifications
CWE-918, CAPEC-664, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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=< 1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Paymenter · Paymenterversion=< 1.5.0

Published CVSS scores

5.3GitHub_MCVSS:3.1/AV:N/AC:L/PR:N/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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