CVE-2024-56527Public exploit

Cross-site scripting via unescaped error message

Published Dec 27, 2024 · Updated Nov 3, 2025

Cross-site scripting in TCPDF before 6.8.0 allows attackers to execute script in a browser through an unescaped error message. Error() destroys the PDF object and, when exception-based error handling is disabled, concatenates the message directly into an HTML die() response without encoding it. Exploitation requires an application to pass attacker-controlled data into an error path and display that response in a browser; script execution is confined to that application's browser context.

CVSS severity4.8
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in TCPDF before 6.8.0 allows attackers to execute script in a browser through an unescaped error message. Error() destroys the PDF object and, when exception-based error handling is disabled, concatenates the message directly into an HTML die() response without encoding it. Exploitation requires an application to pass attacker-controlled data into an error path and display that response in a browser; script execution is confined to that application's browser context.

The record

CVE
CVE-2024-56527
Published
Dec 27, 2024
Updated
Nov 3, 2025
Vendor
Tecnick.com LTD
Product
TCPDF
Classifications
CWE-79
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <6.8.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Tecnick.com LTD · TCPDFversion=0 <6.8.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.8GitHubCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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.

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No observations available

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

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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