NVD / CVE Program· CNA Foxit

CVE-2026-91814: Security vulnerability: Foxit PDF Editor/Reader Fails to Detect Modifications to Signed Documents Displaying Newly Added Content

Noroxi assessment

Priority: Monitor (action score 22/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.09% (FIRST EPSS).
Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed content and potentially carry out content spoofing while the document continues to appear validly signed.

MediumCVSS 5.5 · v3.1—No exploit No fix recorded

Weak crypto

EUVD-2026-85159

Published: Sep 23, 2026
Updated: Oct 29, 2026
EPSS: 0.0% · 0th percentile
CWE: CWE-347

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.0%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 5.5
CNA · Foxit: 5.3; 0.2 point gap

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
foxit	pdf editor	cpe:2.3:a:foxit:pdf_editor
foxit	pdf reader	cpe:2.3:a:foxit:pdf_reader
microsoft	windows	cpe:2.3:o:microsoft:windows
apple	macos	cpe:2.3:o:apple:macos

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

foxit pdf editorup to 13.2.5.63482 inclusive
foxit pdf editor14.0.0.33046 and later · up to 14.0.7.33751 inclusive
foxit pdf editor2023.1.0.15510 and later · up to 2023.3.0.23028 inclusive
foxit pdf editor2024.1.0.23997 and later · up to 2024.4.1.27687 inclusive
foxit pdf editor2025.1.0.27937 and later · up to 2025.3.0.35737 inclusive
foxit pdf editor2026.1.0.36452 and later · up to 2026.2.0.39747 inclusive
foxit pdf editor2025.1.0.66692 and later · up to 2025.3.0.69570 inclusive
foxit pdf editor2026.1.0.70169 and later · up to 2026.2.0.72029 inclusive
foxit pdf editorup to 13.2.2.63349 inclusive
foxit pdf editor14.0.0.68868 and later · up to 14.0.7.69441 inclusive
foxit pdf editor2023.1.0.55583 and later · up to 2023.3.0.63083 inclusive
foxit pdf editor2024.1.0.63682 and later · up to 2024.4.1.66479 inclusive
foxit pdf readerup to 2026.2.0.39747 inclusive
foxit pdf readerup to 2026.2.1.39815 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Foxit). Independent of NVD's CPE analysis and usually ahead of it.

Foxit Software Inc. Foxit PDF Editor
- Versions 2026.2 and earlier, Versions 14.0.7 and earlier, Versions 13.2.6 and earlieraffected
Foxit Software Inc. Foxit PDF Reader
- Versions 2026.2 and earlieraffected

Same product

foxit: all records

Other highest-scoring records for the same primary product.

CVE-2023-27363Foxit PDF Reader exportXFAData Exposed Dangerous Method Remote Code Execution Vulnerability
44Plan
CVE-2024-25938A use-after-free vulnerability exists in the way Foxit Reader 2024.1.0.23997 handles a Barcode widget.
40Plan
CVE-2024-25648A use-after-free vulnerability exists in the way Foxit Reader 2024.1.0.23997 handles a ComboBox widget.
40Plan

Published before and after this one in the same product

← EarlierCVE-2026-91812Sep 23, 2026 · Foxit PDF Editor/Reader FoxitUpdater Improper Certificate Validation Local Privilege Escalation Vulnerability
32Monitor
← EarlierCVE-2026-91813Sep 23, 2026 · Foxit PDF Editor/Reader FoxitUpdater Race Condition Local Privilege Escalation Vulnerability
31Monitor
Later →CVE-2026-91815Sep 23, 2026 · Foxit PDF Editor/Reader JPEG2000 Parsing Memory Corruption Remote Code Execution Vulnerability
31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Jan Slabon (Setasign GmbH & Co. KG), Germanyfinder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2025-55311286 days apartAn issue was discovered in Foxit PDF and Editor for Windows and macOS before 13.2 and 2025 before 2025.2.
26Monitor
CVE-2025-59803286 days apartFoxit PDF Editor and Reader before 2025.2.1 allow signature spoofing via triggers.
21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
No account or password is required.
A user must open a link or visit a page.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Local
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-347 · Improper Verification of Cryptographic Signature

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

nvd-primary

Root cause

The verifier takes the algorithm to verify with from the token’s own header. Untrusted data ends up deciding its own verification rule.

The bug in code

The whole CWE-347 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const claims = jwt.verify(token, publicKey);

Fixed

1const claims = jwt.verify(token, publicKey, {
2  algorithms: ["RS256"],
3  issuer: "https://id.example.com",
4  audience: "portal",
5});

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

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Change log

CVSS5.3 → 5.5Oct 30, 2026, 2:08 PM UTC

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References

www.foxit.com/support/security-bulletins.html

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records