CVE-2020-4987Network attack vector

Credential disclosure via stored JavaScript injection

Published May 4, 2021 · Updated Sep 17, 2024

Stored cross-site scripting in the IBM FlashSystem 900 user management GUI allows remote authenticated users to expose credentials. The GUI stores arbitrary JavaScript supplied by an authenticated user and later renders it in the Web UI without sufficient neutralization. Affected firmware is 1.5.2.8 and earlier and 1.6.1.2 and earlier; the payload executes in a trusted session, altering interface behavior or disclosing credentials.

CVSS severity6.4
Medium
EPSS probability0.50%
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 the IBM FlashSystem 900 user management GUI allows remote authenticated users to expose credentials. The GUI stores arbitrary JavaScript supplied by an authenticated user and later renders it in the Web UI without sufficient neutralization. Affected firmware is 1.5.2.8 and earlier and 1.6.1.2 and earlier; the payload executes in a trusted session, altering interface behavior or disclosing credentials.

The record

CVE
CVE-2020-4987
Published
May 4, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM FlashSystem 900
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=1.5.2.8
  2. Affected versionversion=1.6.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM FlashSystem 900version=1.5.2.8; version=1.6.1.2

Published CVSS scores

5.4NIST NVDCVSS: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
6.4IBM CorporationCVSS:3.0/AV:N/AC:L/PR:L/UI:N/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 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.

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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