CVE-2023-5024Public exploitNetwork attack vector

Browser script execution via unencoded form inputs

Published Sep 17, 2023 · Updated Sep 25, 2024

Cross-site scripting in Planno 23.04.04 allows remote authenticated users to execute JavaScript through the Comment Handler. The comment text and saved-module name fields accept script-bearing markup and reflect it into a response without adequate output encoding. Exploitation requires an authenticated session and user interaction; the public proof shows script execution but does not establish persistence.

CVSS severity4.8
Medium
EPSS probability0.58%
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 Planno 23.04.04 allows remote authenticated users to execute JavaScript through the Comment Handler. The comment text and saved-module name fields accept script-bearing markup and reflect it into a response without adequate output encoding. Exploitation requires an authenticated session and user interaction; the public proof shows script execution but does not establish persistence.

The record

CVE
CVE-2023-5024
Published
Sep 17, 2023
Updated
Sep 25, 2024
Vendor
Planno
Product
Planno
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=23.04.04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Planno · Plannoversion=23.04.04

Published CVSS scores

4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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 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')
T1059.007JavaScript/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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