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CVE Record

CVE-2020-4987: The IBM FlashSystem 900 user management GUI is vulnerable to stored cross-site scripting in code versions 1...

The IBM FlashSystem 900 user management GUI is vulnerable to stored cross-site scripting in code versions 1.5.2.8 and prior and 1.6.1.2 and prior. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session.

MediumCVSS 6.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

IBM FlashSystem 900 management interfaces on the listed older code levels can store malicious JavaScript in the user management GUI. A low-privileged user could alter what another trusted session sees and potentially expose credentials. This is a medium-severity storage administration risk, not a general internet-wide flaw.

Executive priority

Treat as a targeted storage administration exposure. Prioritize remediation for production storage arrays, shared admin environments, or systems with broadly reachable management interfaces. Emergency response is not supported by the provided evidence.

Technical view

CVE-2020-4987 is stored cross-site scripting in the IBM FlashSystem 900 user management GUI. A network-accessible, low-privileged user can embed JavaScript that changes Web UI behavior. The published CVSS 3.0 score is 6.4 with changed scope, low complexity, and low confidentiality and integrity impact.

Likely exposure

Exposure is limited to IBM FlashSystem 900 systems running code 1.5.2.8 and prior or 1.6.1.2 and prior, especially where the management GUI is reachable by more users than necessary.

Exploitation context

The source bundle does not show CISA KEV listing or cite active exploitation. The risk is practical when an authenticated user can write stored content in the GUI and another trusted session later renders it.

Researcher notes

Key constraints are IBM FlashSystem 900, user management GUI, stored XSS, and authenticated low-privilege access. Do not generalize to other IBM storage products without evidence. The provided sources identify affected versions but do not include detailed exploit mechanics.

Mitigation direction

  • Inventory IBM FlashSystem 900 systems and code versions.
  • Review IBM advisory guidance for the vendor-recommended code update.
  • Restrict management GUI access to trusted administration networks.
  • Limit user-management privileges to required administrators only.
  • Monitor administrative accounts for unexpected credential or session activity.

Validation and detection

  • Confirm whether any FlashSystem 900 runs 1.5.2.8, 1.6.1.2, or earlier.
  • Verify the management GUI is not broadly reachable.
  • Review user-management entries for unexpected script-like content.
  • Confirm remediation status against IBM advisory records.
  • Document remaining exceptions and compensating access controls.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2020-4987 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.4 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/A:N/UI:N/S:C/AC:L/I:L/PR:L/AV:N/C:L/RL:O/RC:C/E:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.4CVSS 3.0MediumCVSS:3.0/A:N/UI:N/S:C/AC:L/I:L/PR:L/AV:N/C:L/RL:O/RC:C/E:H3.12.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

6.4Medium
CVSS 3.0 vector shape for CVE-2020-4987Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/A:N/UI:N/S:C/AC:L/I:L/PR:L/AV:N/C:L/RL:O/RC:C/E:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
IBMFlashSystem 9001.6.1.2, 1.5.2.8Listed
Weakness

CWE details

No CWE listed

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