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CVE-2026-27129· NVD / CVE Program· CNA GitHub_M

Cloud Metadata SSRF Protection Bypass via IPv6 Resolution

Craft is a content management system (CMS). In versions 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22, the SSRF validation in Craft CMS’s GraphQL Asset mutation uses `gethostbyname()`, which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection. This is a bypass of the security fix for CVE-2025-68437. Exploitation requires GraphQL schema permissions for editing assets in the `<VolumeName>` volume and creating assets in the `<VolumeName>` volume. These permissions may be granted to authenticated users with appropriate GraphQL schema access and/or Public Schema (if misconfigured with write permissions). Versions 4.16.19 and 5.8.23 patch the issue.

MediumCVSS 5.7 · v4.0—No exploit Fix available
Published
Feb 23, 2026
Updated
Jun 17, 2026
EPSS
0.4% · 34th percentile
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JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
5.7
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
craftcmscraft cms

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • craftcms craft cms3.5.0 and later · before 4.16.19
  • craftcms craft cms5.0.1 and later · before 5.8.23
  • craftcms craft cms5.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • craftcms cms

    • >= 4.5.0-RC1, < 4.16.19, >= 5.0.0-RC1, < 5.8.23affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Packagistcraftcms/cmsfrom 3.5.0 · before 4.16.194.16.19
Packagistcraftcms/cmsfrom 3.5.0 · before 4.16.174.16.17
Packagistcraftcms/cmsfrom 5.0.0-RC1 · before 5.8.235.8.23
Packagistcraftcms/cmsfrom 5.0.0-RC1 · before 5.8.215.8.21

Same product

craftcms: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-32432Craft CMS Allows Remote Code ExecutionKEV
    100Now
  • CVE-2024-56145RCE when PHP `register_argc_argv` config setting is enabled in craftcms/cmsKEV
    96Now
  • CVE-2025-23209Potential RCE with a compromised security key in craft/cmsKEV
    69This week
  • CVE-2023-41892Craft CMS Remote Code Execution vulnerability
    67This week
  • CVE-2020-9757The SEOmatic component before 3.3.0 for Craft CMS allows Server-Side Template Injection that leads to RCE via malformed data to the metacont
    61This week
  • CVE-2025-35939Craft CMS stores user-provided content in session filesKEV
    57Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Packagist:craftcms/cms4.16.17Package registry (OSV)
Packagist:craftcms/cms4.16.19Package registry (OSV)
Packagist:craftcms/cms5.8.21Package registry (OSV)
Packagist:craftcms/cms5.8.23Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-2549314 days apartCraft has a SSRF in GraphQL Asset Mutation via HTTP Redirect
    27Monitor
  • CVE-2026-2549414 days apartCraft has a SSRF in GraphQL Asset Mutation via Alternative IP Notation
    27Monitor
  • CVE-2026-2549214 days apartCraft has a save_images_Asset graphql mutation can be abused to exfiltrate AWS credentials of underlying host
    21Monitor
  • CVE-2025-6843749 days apartCraft CMS vulnerable to Server-Side Request Forgery (SSRF) via GraphQL Asset Upload Mutation
    20Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-918 · Server-Side Request Forgery (SSRF)

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records