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Tue, 27 Oct 2026 13:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Umbraco CMS before 17.7.2 and 18.2.2 Account Takeover via Host Header Poisoning | |
| First Time appeared |
Umbraco
Umbraco umbraco Cms |
|
| Weaknesses | CWE-601 | |
| CPEs | cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Umbraco
Umbraco umbraco Cms |
|
| References |
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| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-27T13:07:49.671Z
Reserved: 2026-10-27T11:25:13.186Z
Link: CVE-2026-117553
No data.
Status : Awaiting Analysis
Published: 2026-10-27T14:16:35.840
Modified: 2026-10-27T16:03:45.247
Link: CVE-2026-117553
No data.
OpenCVE Enrichment
Updated: 2026-10-27T16:15:04Z
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CWE-601
URL Redirection to Untrusted Site ('Open Redirect')