CVE-2026-27129Public exploitNetwork attack vector

Internal HTTP resource reads via IPv6-only hostname resolution

Published Feb 24, 2026 · Updated Feb 24, 2026

SSRF in Craft CMS 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22 allows attackers to read internal HTTP resources. The GraphQL Asset mutation validates a hostname with IPv4-only gethostbyname(), so an IPv6-only AAAA name remains a string, evades the IP blocklist, and is later resolved by the HTTP client. Reachability requires asset create and edit permissions in a GraphQL schema; authenticated schema users qualify, while remote attackers qualify only when a public schema is misconfigured for writes.

CVSS severity6.5
Medium
EPSS probability0.42%
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 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22 allows attackers to read internal HTTP resources. The GraphQL Asset mutation validates a hostname with IPv4-only gethostbyname(), so an IPv6-only AAAA name remains a string, evades the IP blocklist, and is later resolved by the HTTP client. Reachability requires asset create and edit permissions in a GraphQL schema; authenticated schema users qualify, while remote attackers qualify only when a public schema is misconfigured for writes.

The record

CVE
CVE-2026-27129
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-918, T1552.005
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 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=>= 4.5.0-RC1, < 4.16.19
  2. Affected versionversion=>= 5.0.0-RC1, < 5.8.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Pixel & Tonic · Craft CMSversion=>= 4.5.0-RC1, < 4.16.19; version=>= 5.0.0-RC1, < 5.8.23

Published CVSS scores

6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1552.005Unsecured Credentials: Cloud Instance Metadata API

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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