Credential theft via unchecked sandbox origin
Published Dec 17, 2025 · Updated Dec 17, 2025
Credential exposure in KeePassXC-Browser 1.9.9.2 and earlier allows remote attackers to steal stored credentials from sandboxed pages. The isIframeAllowed function checks cross-origin access but does not reject documents whose self.origin is null, so credential filling proceeds inside iframe-attribute or CSP-sandboxed content. A victim must visit attacker-controlled sandboxed content and permit or trigger credential filling; script in that content can then read and exfiltrate populated form fields.
Summary
What happened
Credential exposure in KeePassXC-Browser 1.9.9.2 and earlier allows remote attackers to steal stored credentials from sandboxed pages. The isIframeAllowed function checks cross-origin access but does not reject documents whose self.origin is null, so credential filling proceeds inside iframe-attribute or CSP-sandboxed content. A victim must visit attacker-controlled sandboxed content and permit or trigger credential filling; script in that content can then read and exfiltrate populated form fields.
The record
- CVE
- CVE-2025-65203
- Published
- Dec 17, 2025
- Updated
- Dec 17, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-353, CWE-640, CWE-352, T1555
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 17, 2025CVE publishedPublication date reported by the CVE source.
- Dec 17, 2025Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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