How severe is CVE-2025-65203?

CVE-2025-65203 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2025-65203 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65203?

CVE-2025-65203 affects Keepassxc Keepassxc-browser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65203?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-65203 have an EU (EUVD) identifier?

Yes. CVE-2025-65203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203910.

When was CVE-2025-65203 published?

CVE-2025-65203 was published on 2025-12-17 and last updated on 2026-06-17.

CVE-2025-65203

CVE-2025-65203 is a high-severity vulnerability in Keepassxc Keepassxc-browser with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203910
Weakness: CWE-352
Affected product: Keepassxc Keepassxc-browser
Published: 2025-12-17
Last modified: 2026-06-17

Description

KeePassXC-Browser thru 1.9.9.2 autofills or prompts to fill stored credentials into documents rendered under a browser-enforced CSP directive and iframe attribute sandbox, allowing attacker-controlled script in the sandboxed document to access populated form fields and exfiltrate credentials.

Frequently asked questions

What is CVE-2025-65203?: KeePassXC-Browser thru 1.9.9.2 autofills or prompts to fill stored credentials into documents rendered under a browser-enforced CSP directive and iframe attribute sandbox, allowing attacker-controlled script in the sandboxed document to access populated form fields and exfiltrate credentials.
How severe is CVE-2025-65203?: CVE-2025-65203 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2025-65203 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65203?: CVE-2025-65203 affects Keepassxc Keepassxc-browser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65203?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-65203 have an EU (EUVD) identifier?: Yes. CVE-2025-65203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203910.
When was CVE-2025-65203 published?: CVE-2025-65203 was published on 2025-12-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:keepassxc:keepassxc-browser:*:*:*:*:*:*:*:*

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