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VulnerabilityPublished

CVE-2025-66523: na1.foxitesign.foxit.com · XSS or 'Cross-site Scripting'

Affects na1.foxitesign.foxit.comSource CVE Database V5

0

Not known to be exploited · CVSS 6.1 Medium.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Foxit Software Inc.na1.foxitesign.foxit.comAffected
  • =before 2026‑01‑16
Fixed in–

AI-suggested

Organizations should prioritize applying the official patch from Foxit Software as soon as it becomes available (post-2026-01-16). Until then, they should implement strict input validation and output encoding on any user-controllable inputs, especially URL parameters, to prevent script injection. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Educate users to be cautious about clicking on unsolicited or suspicious links, particularly those purporting to come from trusted internal sources. Monitor logs for unusual URL access patterns that might indicate attempted exploitation. If feasible, restrict access to the affected service to trusted networks or via VPN to reduce exposure. Additionally, consider deploying web application firewalls (WAFs) with rules designed to detect and block XSS payloads targeting this vulnerability. Regularly review and update security awareness training to include phishing and XSS risks related to document signing platforms.

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.

References

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