Documenso - Assistant Recipient Can Forge Another Signer's Signature in Sequential-Signing Documents
CVSS score
6.5
EPSS probability
%0.3
Risk score
0.0
Published
2 mo ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%61
Short explanation
An assistant recipient in Documenso can forge another signer's signature in sequential-signing documents due to missing authorization checks in the V1 signing path. The vulnerability is not present in the V2 path, which explicitly blocks assistant access to SIGNATURE fields. CVSS score is 6.5 (MEDIUM). Patch status is UNKNOWN.
This allows unauthorized forgery of signatures in document workflows, undermining trust in electronic signing. The vulnerability is specific to sequential signing and does not affect other document operations. It highlights a critical gap in role-based access control in the V1 signing path.
What should be done?
- Patch the sign-field-with-token.ts handler to validate field type and ownership
- Ensure assistant role cannot complete SIGNATURE fields in sequential signing
- Follow vendor advisory for version-specific fixes
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
Documenso'da ASSISTANT rolüne sahip bir alıcı, sıralı imzalama belgelerinde başka bir imzalayanın imzasını istismar edebilir, çünkü sign-field-with-token.ts işleyicisi, imza türüne ve sahibine dair doğrulama yapmaz.
Açık, V1 imzalama yolu (sign-field-with-token.ts) üzerinde mevcuttur ve yeni V2 yolu (sign-envelope-field.ts) tarafından SIGNATURE alanlarına助理 erişimini engeller.
CVSS puanı 6.5 (ORTA) olup, bütünlükte orta etki yaratır ve gizlilik veya kullanılabilirlik riski yoktur.
Show the technical text from the sources
Documenso's sign-field-with-token.ts, used by the live document-signing UI, allows a recipient with the ASSISTANT role to fetch and complete fields belonging to any later-or-equal-order, not-yet-signed recipient in the same envelope, with no restriction on field type. A newer V2 signing path (sign-envelope-field.ts) explicitly blocks assistants from completing SIGNATURE fields, and the project's own test suite comments confirm this guard is absent from the V1 path used here.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE: CWE-863
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-71247 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | documenso | documenso | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 6.5 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N | CVE CNA |
| 6.5 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-71247 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-71247 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
6.5 / 10Vulnerability Scoring Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NYama durumu bilinmiyor
Weakness Type (CWE & CAPEC)
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