CVE-2025-53626Public exploitNetwork attack vector

JavaScript execution via expression sandbox escape

Published Jul 10, 2025 · Updated Jul 10, 2025

Code injection in pdfme 5.2.0 through 5.4.0 allows remote attackers to execute JavaScript through a crafted PDF template. The evaluator exposes the Function constructor through Object.getOwnPropertyDescriptor and prototype access, while Object.assign can invoke inherited accessor methods to modify object prototypes. Exploitation requires an application to evaluate attacker-controlled template expressions and user interaction; successful payloads run in the application's JavaScript context, enabling script execution, cookie or token access, and application-behavior changes.

CVSS severity6.1
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in pdfme 5.2.0 through 5.4.0 allows remote attackers to execute JavaScript through a crafted PDF template. The evaluator exposes the Function constructor through Object.getOwnPropertyDescriptor and prototype access, while Object.assign can invoke inherited accessor methods to modify object prototypes. Exploitation requires an application to evaluate attacker-controlled template expressions and user interaction; successful payloads run in the application's JavaScript context, enabling script execution, cookie or token access, and application-behavior changes.

The record

CVE
CVE-2025-53626
Published
Jul 10, 2025
Updated
Jul 10, 2025
Vendor
pdfme
Product
pdfme
Classifications
CWE-1321, CWE-94, CWE-79, T1203, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 5.2.0, < 5.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pdfme · pdfmeversion=>= 5.2.0, < 5.4.1

Published CVSS scores

6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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