CVE-2023-38881Public exploitNetwork attack vector

Browser script execution via unneutralized calendar parameters

Published Nov 20, 2023 · Updated Aug 2, 2024

Reflected XSS in OS4ED openSIS Classic Community Edition 9.0 allows remote attackers to execute JavaScript via CalendarModal.php. CalendarModal.php reflects the calendar_id, school_date, month, or year query parameter into the response without neutralizing HTML script markup. A victim must open a crafted URL, after which the script runs in that user’s browser under the openSIS origin and can read or alter data available to the session.

CVSS severity6.1
Medium
EPSS probability0.62%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in OS4ED openSIS Classic Community Edition 9.0 allows remote attackers to execute JavaScript via CalendarModal.php. CalendarModal.php reflects the calendar_id, school_date, month, or year query parameter into the response without neutralizing HTML script markup. A victim must open a crafted URL, after which the script runs in that user’s browser under the openSIS origin and can read or alter data available to the session.

The record

CVE
CVE-2023-38881
Published
Nov 20, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 20, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 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')
T1059.007JavaScript/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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