CVE-2019-25729

PDF Signer 3.0 Server-Side Template Injection RCE via CSRF Cookie

Published Jun 4, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

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.

Analysis

Technical impact

Server‑side template injection in PDF Signer 3.0 occurs through the CSRF‑TOKEN cookie, allowing attackers to inject PHP commands such as shell_exec() into cookie values. This flaw is exploitable without authentication and can lead to arbitrary system command execution, data theft, and full compromise of the affected server.

Affected Systems

The vulnerability affects Simcy Creative's PDF Signer 3.0. No other affected versions were disclosed in the advisory, so the only known vulnerable release is the 3.0 edition.

Risk and Exploitability

The CVSS score of 9.3 indicates critical severity. An unauthenticated attacker can craft a malicious CSRF‑TOKEN cookie, bypass CSRF defenses, and drive code execution without needing to log in. The EPSS score is not available, and the flaw is not listed in CISA’s KEV catalog, but the high CVSS combined with the lack of authentication requirement means the risk is high and exploitation is likely if attackers target the product.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

simcy_creative

PDF Signer

affected

Version	Status	Constraints
`3.0`	affected	—

No data.

Vendor Product Versions

Simcy Creative

Pdf Signer

Version	Status	Scheme	Platform
`3.0`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade PDF Signer to the latest patched release (any version after 3.0).
If an upgrade is not immediately possible, configure the web server to block or whitelist CSRF‑TOKEN cookie values and enforce SameSite and HttpOnly attributes.
Deploy a web application firewall that detects and blocks template injection payloads in cookie headers.
Ensure all CWE‑352 related CSRF protections are enabled and review input sanitization for cookie parameters.

Generated by OpenCVE AI on June 4, 2026 at 14:39 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.258% probability within 30 days)

Exploitation poc

Automatable yes

Technical Impact total

References

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

History

Jun 5, 2026 10:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Simcy Creative Simcy Creative pdf Signer
Vendors & Products		Simcy Creative Simcy Creative pdf Signer

Jun 4, 2026 2:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Jun 4, 2026 1:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		PDF Signer 3.0 Server-Side Template Injection RCE via CSRF Cookie
Weaknesses		CWE-352
References		https://codecanyon.net/item/signer-create-digital-signatures-and-sign-pdf-documents-online/20737707 https://codecanyon.net/user/simcy_creative https://www.exploit-db.com/exploits/46276 https://www.vulncheck.com/advisories/pdf-signer-server-side-template-injection-rce-via-csrf-cookie
Metrics		cvssV3_1 `{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}` cvssV4_0 `{'score': 9.3, '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'}`