What’s Vulnerable › Vulnerabilities

CVE-2026-63630: BentoPDF: Workflow Import Allows Unvalidated TSA URL Leading to PDF Hash Exfiltration via RFC 3161 Requests

• Severity: low (CVSS 3.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-30
• Weakness: CWE-201

Description

BentoPDF is a client-side PDF toolkit that is self hostable. In 2.8.6 and earlier, deserializeWorkflow() accepts the Timestamp node's tsaUrl control from imported JSON without schema or destination validation. When a user imports the crafted workflow and runs it against a PDF, timestampPdf() sends an RFC 3161 TimeStampReq containing the PDF's SHA-256 MessageImprint to the attacker-selected endpoint. The default self-hosted configuration does not set VITE_CORS_PROXY_URL, so the request bypasses the proxy's ALLOWED_TSA_HOSTS checks and is sent directly. The disclosed digest can confirm that a document matches a known file and can correlate the same document across users without revealing its contents. This vulnerability is fixed in 2.8.7.

Affected products

• alam00000 bentopdf: before 2.8.7

References

• https://github.com/alam00000/bentopdf/commit/b21f602cca972320bfffbf72e37df535313a6e48
• https://github.com/alam00000/bentopdf/releases/tag/v2.8.7
• https://github.com/alam00000/bentopdf/security/advisories/GHSA-cx8x-7rrr-r9x8
• https://github.com/alam00000/bentopdf/security/advisories/GHSA-cx8x-7rrr-r9x8

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