CVE-2026-55791
1 advisory.
Packagist/craftcms/cms CVE-2026-55791: critical
Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs
Action: Upgrade craftcms/cms to 4.18 or later.
composer require craftcms/cms:5.10composer require craftcms/cms:4.18Affected
| introduced | fixed | last affected |
|---|---|---|
| 5.0.0-RC1 | 5.10 | - |
| 4.0.0-RC1 | 4.18 | - |
Fixed versions
| 5.10 | 4.18 |
Sources
- osv: GHSA-c55v-343g-5xff
- https://github.com/craftcms/cms/security/advisories/GHSA-c55v-343g-5xff
- https://github.com/craftcms/cms/pull/18559
- https://github.com/craftcms/cms
CVE-2026-55791 · published · modified · JSON