CVE-2025-66523
CVE-2025-66523 is a medium-severity vulnerability in Foxit Esign with a CVSS 3.x base score of 6.1. 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-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- EPSS exploit prediction: 0% (8th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-3463
- Weakness: CWE-79
- Affected product: Foxit Esign
- Published:
- Last modified:
Description
URL parameters are directly embedded into JavaScript code or HTML attributes without proper encoding or sanitization. This allows attackers to inject arbitrary scripts when an authenticated user visits a crafted link. This issue affects na1.foxitesign.foxit.com: before 2026‑01‑16.
Frequently asked questions
- What is CVE-2025-66523?
- URL parameters are directly embedded into JavaScript code or HTML attributes without proper encoding or sanitization. This allows attackers to inject arbitrary scripts when an authenticated user visits a crafted link. This issue affects na1.foxitesign.foxit.com: before 2026‑01‑16.
- How severe is CVE-2025-66523?
- CVE-2025-66523 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2025-66523 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-66523?
- CVE-2025-66523 affects Foxit Esign. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-66523?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-66523 have an EU (EUVD) identifier?
- Yes. CVE-2025-66523 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3463.
- When was CVE-2025-66523 published?
- CVE-2025-66523 was published on 2026-01-20 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:foxit:esign:*:*:*:*:*:*:*:*
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