GHSA-8jr8-7hr4-vhfx: craftcms/cms (CVE-2026-25493)

Package	Ecosystem	Affected	Fixed in
craftcms/cms	Packagist	>=5.0.0-RC1, <5.8.22 \|\| >=4.0.0-RC1, <4.16.18	5.8.22, 4.16.18

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Craft CMS versions from 4.0.0-RC1 before 4.16.18 and from 5.0.0-RC1 before 5.8.22 are vulnerable to server-side request forgery through the saveAsset GraphQL mutation. The mutation checks the initial URL against a blocklist, but HTTP redirects are followed, so an attacker who can send GraphQL requests could make the server fetch internal addresses, such as cloud metadata endpoints, and save the response as an asset. Upgrade to Craft CMS 4.16.18 or 5.8.22. The source suggests disabling HTTP redirects as a workaround, but it does not say how to do this in Craft CMS.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.9	Medium	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0040, the 34th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:26 UTC First seen by agentprime
31 Oct 2026, 14:26 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.