CVE-2026-117553
CVE-2026-117553 · Umbraco CMS before 17.7.2 and 18.2.2 Account Takeover via Host Header Poisoning
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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.
CVSS 7.7 · Hoch · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Betroffene Produkte und Versionen
umbraco-cms
- Softwareversionen
- ≥ 0, < 17.7.2: Betroffen (semver)
- ≥ 18.0.0, < 18.2.2: Betroffen (semver)
Auf 17.7.2 aktualisieren; Auf 18.2.2 aktualisieren
Originalquellen
- https://github.com/umbraco/Umbraco-CMS/commit/490b9b27dcbb8fb3fe868a36203590968b0569d6
- https://github.com/umbraco/Umbraco-CMS
- https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-rpv9-qp4c-g469
- https://github.com/umbraco/Umbraco-CMS/blob/release-18.2.1/src/Umbraco.Cms.Api.Management/Middleware/BackOfficeAuthorizationInitializationMiddleware.cs#L74-L112
- https://www.vulncheck.com/advisories/umbraco-cms-before-17.7.2-and-18.2.2-account-takeover-via-host-header-poisoning
- https://nvd.nist.gov/vuln/detail/CVE-2026-117553