Foxit PDF Editor: Improper Certificate Validation
CVE-2026-91812 is a high-severity improper certificate validation vulnerability in Foxit PDF Editor from Foxit, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Foxit PDF Editor versions: Versions 2026.2 and earlier; Versions 14.0.7 and earlier; Versions 13.2.6 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.14% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Foxit PDF Editor you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on foxit.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Foxit Software | Foxit PDF Editor | Versions 2026.2 and earlier; Versions 14.0.7 and earlier; Versions 13.2.6 and earlier | Not stated |
| Foxit Software | Foxit PDF Reader | Versions 2026.2 and earlier | Not stated |
| Foxit | PDF Editor | 13.2.5.63482 and earlier; 14.0.0.33046 through 14.0.7.33751; 2023.1.0.15510 through 2023.3.0.23028; 2024.1.0.23997 through 2024.4.1.27687; 2025.1.0.27937 through 2025.3.0.35737; 2026.1.0.36452 through 2026.2.0.39747 | Not stated |
| Foxit | PDF Reader | 2026.2.0.39747 and earlier | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.9 | High | CNA |
| CVSS 3.1 | 8.1 | High | NVD |
Official description
A vulnerability in Foxit PDF Editor/Reader’s update mechanism allows man-in-the-middle attackers to bypass certificate validation and package integrity checks, potentially enabling arbitrary code execution with system privileges.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Certificate Validation
The product does not validate, or incorrectly validates, a certificate.
How developers prevent this class of flaw
- Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
- If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
More Improper Certificate Validation vulnerabilities (CWE-295)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Foxit PDF Editor
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
Recent Improper Certificate Validation vulnerabilities
- 7.4 High severity
- 9.1 Critical severity
- 7.5 High severity
- 9.3 Critical severity
- 8.3 High severity
- 9.8 Critical severity
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