CVE-2021-30174Network attack vector

Authenticated stored XSS via unfiltered event field

Published May 11, 2021 · Updated Sep 16, 2024

Stored XSS in Riya Lab Co., Ltd. CloudISO 2021.2a and earlier allows remote authenticated users to inject JavaScript through event records. The event-creation path stores special characters from a time-management field without filtering them before later page rendering. A low-privileged account and a victim who views the stored event are required, enabling script execution in that victim's browser context.

CVSS severity5.4
Medium
EPSS probability0.59%
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 Riya Lab Co., Ltd. CloudISO 2021.2a and earlier allows remote authenticated users to inject JavaScript through event records. The event-creation path stores special characters from a time-management field without filtering them before later page rendering. A low-privileged account and a victim who views the stored event are required, enabling script execution in that victim's browser context.

The record

CVE
CVE-2021-30174
Published
May 11, 2021
Updated
Sep 16, 2024
Vendor
Riya Lab Co., Ltd.
Product
CloudISO
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=unspecified <=2021.2a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Riya Lab Co., Ltd. · CloudISOversion=unspecified <=2021.2a

Published CVSS scores

5.4TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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