CVE-2023-5811Public exploitNetwork attack vector

Authenticated script execution via unsanitized menu_id embedding

Published Oct 27, 2023 · Updated Aug 2, 2024

Cross-site scripting in Flusity CMS allows remote authenticated users to execute script in another backend user's browser via menu_id. In core/tools/posts.php, loadPostAddForm inserts the raw GET menu_id value into an inline JavaScript call without numeric filtering or HTML escaping. Backend access and a user opening the crafted request are required; successful exploitation runs attacker-supplied script in that user's CMS origin.

CVSS severity2.4
Low
EPSS probability0.52%
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 Flusity CMS allows remote authenticated users to execute script in another backend user's browser via menu_id. In core/tools/posts.php, loadPostAddForm inserts the raw GET menu_id value into an inline JavaScript call without numeric filtering or HTML escaping. Backend access and a user opening the crafted request are required; successful exploitation runs attacker-supplied script in that user's CMS origin.

The record

CVE
CVE-2023-5811
Published
Oct 27, 2023
Updated
Aug 2, 2024
Vendor
Flusity
Product
Flusity CMS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Flusity · Flusity CMSversion=n/a

Published CVSS scores

2.4VulDB CNACVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
2.4VulDB CNACVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.3VulDB CNAAV:N/AC:L/Au:M/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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