CVE-2024-28097Network attack vector

Authenticated session actions via stored calendar XSS

Published Mar 7, 2024 · Updated Aug 26, 2024

Stored XSS in Schoolbox Calendar before 23.1.3 allows remote authenticated users to execute actions in affected users' sessions. Published sources do not identify the Calendar input or output-rendering path that stores and emits the untrusted script. The attacker needs an account, and another user must view the crafted calendar content; script execution can expose or alter data available to that user's session.

CVSS severity7.3
High
EPSS probability0.37%
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 Schoolbox Calendar before 23.1.3 allows remote authenticated users to execute actions in affected users' sessions. Published sources do not identify the Calendar input or output-rendering path that stores and emits the untrusted script. The attacker needs an account, and another user must view the crafted calendar content; script execution can expose or alter data available to that user's session.

The record

CVE
CVE-2024-28097
Published
Mar 7, 2024
Updated
Aug 26, 2024
Vendor
Schoolbox Pty Ltd
Product
Schoolbox
Classifications
CWE-79, CAPEC-104, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2024Record 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=0 <23.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Schoolbox Pty Ltd · Schoolboxversion=0 <23.1.3

Published CVSS scores

7.3The Missing Link AustraliaCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
5.4NIST National Vulnerability DatabaseCVSS: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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-104Cross Zone 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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