CVE-2026-41129Public exploitNetwork attack vector

Authenticated internal-service access via unrestricted upload schemes

Published Apr 21, 2026 · Updated Apr 21, 2026

SSRF in Craft CMS 4.0.0-RC1 through 4.17.8 and 5.0.0-RC1 through 5.9.14 allows remote authenticated users to reach internal services. The GraphQL asset upload mutation accepts a user-supplied URL without restricting its scheme to HTTP or HTTPS, allowing Gopher-wrapped TCP commands and obfuscated loopback hosts. Exploitation requires schema permissions to edit and create assets in the target volume; successful requests can send attacker-selected traffic to reachable internal services.

CVSS severityUnavailable
Unscored
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Craft CMS 4.0.0-RC1 through 4.17.8 and 5.0.0-RC1 through 5.9.14 allows remote authenticated users to reach internal services. The GraphQL asset upload mutation accepts a user-supplied URL without restricting its scheme to HTTP or HTTPS, allowing Gopher-wrapped TCP commands and obfuscated loopback hosts. Exploitation requires schema permissions to edit and create assets in the target volume; successful requests can send attacker-selected traffic to reachable internal services.

The record

CVE
CVE-2026-41129
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=>= 4.0.0-RC1, < 4.17.9
  2. Affected versionversion=>= 5.0.0-RC1, < 5.9.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Pixel & Tonic · Craft CMSversion=>= 4.0.0-RC1, < 4.17.9; version=>= 5.0.0-RC1, < 5.9.15

Published CVSS scores

5.5GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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