Phishing redirects via unchecked OIDC URL parameter
Published Apr 6, 2026 · Updated Apr 6, 2026
Open redirect in Ascertia SigningHub User 10.0 allows remote attackers to send users to external sites through crafted links. The unauthenticated /OAuth/OIDCAuthenticate endpoint accepts an attacker-controlled url parameter and redirects the browser without validating the destination. A victim must follow the link; the demonstrated consequence is redirection to an attacker-controlled phishing page, not direct server compromise.
Summary
What happened
Open redirect in Ascertia SigningHub User 10.0 allows remote attackers to send users to external sites through crafted links. The unauthenticated /OAuth/OIDCAuthenticate endpoint accepts an attacker-controlled url parameter and redirects the browser without validating the destination. A victim must follow the link; the demonstrated consequence is redirection to an attacker-controlled phishing page, not direct server compromise.
The record
- CVE
- CVE-2025-61166
- Published
- Apr 6, 2026
- Updated
- Apr 6, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-601, CAPEC-178, T1566.002, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 6, 2026CVE publishedPublication date reported by the CVE source.
- Apr 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Malicious OPEN Redirection CVE-2025-61166proof of concept · demonstrated
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Technologies
Your stack
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Your stack
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