CVE-2021-24807Public exploitNetwork attack vector

Stored script execution via unsanitized chat notes

Published Nov 8, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in Schiocco Support Board before 3.3.5 allows remote authenticated users to execute script via chat notes. The add-note AJAX function accepts a script-bearing message parameter and stores it for later rendering in the chat view without neutralization. Agent-level access is required to plant the payload, and script execution occurs when an administrator or another authenticated user opens the affected chat.

CVSS severity5.4
Medium
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Schiocco Support Board before 3.3.5 allows remote authenticated users to execute script via chat notes. The add-note AJAX function accepts a script-bearing message parameter and stores it for later rendering in the chat view without neutralization. Agent-level access is required to plant the payload, and script execution occurs when an administrator or another authenticated user opens the affected chat.

The record

CVE
CVE-2021-24807
Published
Nov 8, 2021
Updated
Aug 3, 2024
Vendor
Schiocco
Product
Support Board
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=3.3.5 <3.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Schiocco · Support Boardversion=3.3.5 <3.3.5

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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