CVE-2026-91803 — Pdf Editor
HIGHCVE-2026-91803 is a high-severity (CVSS 8.8) CWE-427 vulnerability in foxit pdf editor. No vendor fix is recorded yet; mitigation options are listed below.
A local privilege escalation vulnerability exists in the updater of Foxit PDF Editor/Reader due to unsafe loading of dynamic-link libraries from a user-writable directory during high-privilege…
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-91803.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-91803 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 384,189 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Description
A local privilege escalation vulnerability exists in the updater of Foxit PDF Editor/Reader due to unsafe loading of dynamic-link libraries from a user-writable directory during high-privilege operations. A local attacker could exploit this issue to execute code with elevated privileges.
Affected Products
pdf editorfoxitpdf readerfoxitDetection & mitigation playbook
Vendor / applianceDetect
Inventory every foxit pdf editor deployment and check each version against the affected-products list above.
Remediation status
No patch has shipped for CVE-2026-91803 yet — track the foxit pdf editor advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-91803 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.