CVE-2022-24899Public exploitNetwork attack vector

Stored cross-site scripting via unescaped canonical URI

Published May 5, 2022 · Updated Apr 23, 2025

Stored cross-site scripting in Contao 4.13.0 through 4.13.2 allows remote attackers to inject code into front-end canonical tags. PageRegular::prepare assigns the request-derived canonical URI to the template without HTML escaping, allowing attribute-breaking markup to reach the rendered link element. Canonical tags must be enabled, and rendering an affected page executes the injected code in the visitor's browser under the page's origin.

CVSS severity5.3
Medium
EPSS probability4.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Contao 4.13.0 through 4.13.2 allows remote attackers to inject code into front-end canonical tags. PageRegular::prepare assigns the request-derived canonical URI to the template without HTML escaping, allowing attribute-breaking markup to reach the rendered link element. Canonical tags must be enabled, and rendering an affected page executes the injected code in the visitor's browser under the page's origin.

The record

CVE
CVE-2022-24899
Published
May 5, 2022
Updated
Apr 23, 2025
Vendor
Contao
Product
Contao
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 4.13.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Contao · Contaoversion=< 4.13.3

Published CVSS scores

7.2GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
5.3GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/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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