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Medium, CVSS 6.9

Craft CMS Vulnerable to SSRF in GraphQL Asset Mutation via HTTP Redirect

CVE-2026-25493GHSA-8jr8-7hr4-vhfx

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (craftcms/cms 5.8.22, 4.16.18), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist craftcms/cms

    Affected
    >= 5.0.0-RC1, <= 5.8.21>= 4.0.0-RC1, <= 4.16.17
    Fixed in
    5.8.22, 4.16.18

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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 · score source
EPSS
  • CVE-2026-25493: 0.40% estimated exploitation activity in the next 30 days; percentile 34.68 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary The saveAsset GraphQL mutation validates the initial URL hostname and resolved IP against a blocklist, but Guzzle follows HTTP redirects by default. An attacker can bypass all SSRF protections by hosting a redirect that points to cloud metadata endpoints or any internal IP addresses. --- Proof of Concept 1. Host a redirect script on your server (e.g. redirect.php): 2. Send the following GraphQL mutation: 3. The application validates attacker.com (passes) 4. Guzzle follows the redirect to 169.254.169.254 5. Cloud metadata is saved as an asset --- Mitigation - Disable redirects.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-8jr8-7hr4-vhfx

Agent brief

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# Patch Next advisory brief: CVE-2026-25493

Advisory: Craft CMS Vulnerable to SSRF in GraphQL Asset Mutation via HTTP Redirect
IDs: CVE-2026-25493, GHSA-8jr8-7hr4-vhfx
Record: https://patchnext.com/advisories/cve-2026-25493 (revision 1, source checked 26 Oct 2026, 14:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: craftcms/cms 5.8.22, 4.16.18. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist craftcms/cms: affected >= 5.0.0-RC1, <= 5.8.21; >= 4.0.0-RC1, <= 4.16.17; fixed in 5.8.22, 4.16.18

## Suggested inspection (read-only)
- Packagist craftcms/cms: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on craftcms/cms.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-8jr8-7hr4-vhfx (GitHub-reviewed advisory GHSA-8jr8-7hr4-vhfx lists affected ranges: Packagist craftcms/cms >=5.0.0-RC1 =4.0.0-RC1 <=4.16.17)

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