7.5Alta
CVE-2026-117553Umbraco CMS before 17.7.2 and 18.2.2 Account Takeover via Host Header Poisoning
Descripción
Umbraco CMS before 17.7.2 and 18.2.2 contains an authentication bypass vulnerability that allows unauthenticated attackers to register attacker-controlled OAuth redirect URIs by poisoning the Host header. Attackers send signed-in users authorization links using response_mode=form_post to capture codes, then redeem them via HTTP Basic client credentials to hijack back-office sessions and execute code through Razor templates.
Debilidad (CWE):
CWE-601
Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.
Productos y versiones afectados
| Fabricante | Producto | Versiones | |
|---|---|---|---|
| umbraco | Umbraco-CMS | < 17.7.2, 18.0.0 – < 18.2.2 |
Referencias y parches
- Patch Commit patch
- https://github.com/umbraco/Umbraco-CMS product
- GitHub Security Advisory (GHSA-rpv9-qp4c-g469) vendor-advisory
- https://github.com/umbraco/Umbraco-CMS/blob/release-18.2.1/src/Umbraco.Cms.Api.Management/Middleware/BackOffi… technical-description
- VulnCheck Advisory: Umbraco CMS before 17.7.2 and 18.2.2 Account Takeover via Host Header Poisoning third-party-advisory