CVE-2023-46734Network attack vector

Cross-site scripting via unescaped CodeExtension filters

Published Nov 10, 2023 · Updated Feb 13, 2025

Cross-site scripting in Symfony Twig Bridge before 4.4.51, 5.4.31, or 6.3.8 allows remote attackers to execute browser scripts. CodeExtension marks abbr_class, abbr_method, format_args, and file_excerpt filter output as safe HTML while emitting unescaped input into HTML markup. Exposure requires the development-only CodeExtension to be enabled explicitly in production and a user to render attacker-controlled output.

CVSS severity6.1
Medium
EPSS probability0.68%
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 Symfony Twig Bridge before 4.4.51, 5.4.31, or 6.3.8 allows remote attackers to execute browser scripts. CodeExtension marks abbr_class, abbr_method, format_args, and file_excerpt filter output as safe HTML while emitting unescaped input into HTML markup. Exposure requires the development-only CodeExtension to be enabled explicitly in production and a user to render attacker-controlled output.

The record

CVE
CVE-2023-46734
Published
Nov 10, 2023
Updated
Feb 13, 2025
Vendor
Symfony
Product
Symfony
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=>= 2.0.0, < 4.4.51
  2. Affected versionversion=>= 5.0.0, < 5.4.31
  3. Affected versionversion=>= 6.0.0, < 6.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Symfony · Symfonyversion=>= 2.0.0, < 4.4.51; version=>= 5.0.0, < 5.4.31; version=>= 6.0.0, < 6.3.8

Published CVSS scores

6.1GitHub Advisory DatabaseCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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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