CVE-2026-45072Network attack vector

Stored XSS via unescaped non-PHP file excerpts

Published Jul 14, 2026 · Updated Jul 14, 2026

Stored XSS in affected Symfony profiler components allows attackers to execute script in a developer's browser through a crafted project file. CodeExtension::fileExcerpt splits non-PHP contents into lines and inserts them into code elements without HTML escaping. Exploitation requires write access to a file under the project root and a developer who later opens that file in the development profiler.

CVSS severity2.0
Low
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in affected Symfony profiler components allows attackers to execute script in a developer's browser through a crafted project file. CodeExtension::fileExcerpt splits non-PHP contents into lines and inserts them into code elements without HTML escaping. Exploitation requires write access to a file under the project root and a developer who later opens that file in the development profiler.

The record

CVE
CVE-2026-45072
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Symfony
Product
Symfony
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record 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=>= 6.4.24, < 6.4.40
  2. Affected versionversion=>= 7.2.9, < 7.4.12
  3. Affected versionversion=>= 8.0.0-BETA1, < 8.0.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Symfony · Symfonyversion=>= 6.4.24, < 6.4.40; version=>= 7.2.9, < 7.4.12; version=>= 8.0.0-BETA1, < 8.0.12
Symfony · Symfony Twig Bridgeversion=>= 6.4.24, < 6.4.40
Symfony · Symfony WebProfiler Bundleversion=>= 7.2.9, < 7.4.12; version=>= 8.0.0-BETA1, < 8.0.12

Published CVSS scores

2.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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