CVE-2011-3183Public exploitNetwork attack vector

Script execution via unsanitized rcID reflection

Published Jan 14, 2020 · Updated Aug 6, 2024

Reflected XSS in Concrete CMS 5.4.1.1 and earlier allows remote attackers to execute script in a victim's browser via rcID. The unauthenticated do_login endpoint reflects the unsanitized rcID value into its HTML response, allowing attribute-breaking input to become executable markup. A victim must submit an attacker-controlled login request, after which the script runs in the site's browser origin.

CVSS severity6.1
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Concrete CMS 5.4.1.1 and earlier allows remote attackers to execute script in a victim's browser via rcID. The unauthenticated do_login endpoint reflects the unsanitized rcID value into its HTML response, allowing attribute-breaking input to become executable markup. A victim must submit an attacker-controlled login request, after which the script runs in the site's browser origin.

The record

CVE
CVE-2011-3183
Published
Jan 14, 2020
Updated
Aug 6, 2024
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record 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=through 5.4.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Concrete CMS · Concrete CMSversion=through 5.4.1.1

Published CVSS scores

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')
T1189Drive-by Compromise

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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