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CVE Record

CVE-2021-27887: Stored XSS vulnerability in Ellipse APM

Cross-site Scripting (XSS) vulnerability in the main dashboard of Ellipse APM versions allows an authenticated user or integrated application to inject malicious data into the application that can then be executed in a victim’s browser. This issue affects: Hitachi ABB Power Grids Ellipse APM 5.3 version 5.3.0.1 and prior versions; 5.2 version 5.2.0.3 and prior versions; 5.1 version 5.1.0.6 and prior versions.

MediumCVSS 6.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Ellipse APM can store malicious dashboard data that later runs script in another user's browser. This is a moderate business risk because it requires authenticated access or an integrated data path, but successful abuse could expose sensitive browser-accessible information.

Executive priority

Treat as a moderate-priority remediation item for affected Ellipse APM environments. Prioritize systems with broad user access, sensitive asset data, or many integrations feeding dashboard content.

Technical view

CVE-2021-27887 is stored XSS in the main dashboard of Hitachi ABB Power Grids Ellipse APM. A low-privileged authenticated user or integrated application can inject data that executes when a victim views it. CVSS 3.1 score is 6.3.

Likely exposure

Exposure is limited to Ellipse APM 5.3.0.1 and earlier, 5.2.0.3 and earlier, and 5.1.0.6 and earlier, especially where dashboard data can be written by users or integrations.

Exploitation context

The provided sources do not show active exploitation, and KEV is false. Abuse requires authenticated access or an integrated application path, plus user interaction when a victim views the affected dashboard content.

Researcher notes

The source bundle identifies affected version ranges and attack conditions but does not include CWE, fixed version details, or exploitation evidence. Avoid assuming a patch level beyond vendor advisory confirmation.

Mitigation direction

  • Inventory Ellipse APM deployments and record exact versions.
  • Check ABB/Hitachi vendor guidance for fixed versions or supported mitigations.
  • Restrict dashboard access to trusted users until remediation is confirmed.
  • Review integrated applications that can write dashboard-visible data.
  • Monitor for suspicious stored content or unexpected dashboard script behavior.

Validation and detection

  • Compare deployed versions against the affected version ranges.
  • Confirm whether any dashboard-facing integrations submit untrusted data.
  • Review access controls for users who can modify dashboard-visible data.
  • Validate remediation using authorized, non-destructive testing in staging.
  • Document residual exposure if vendor guidance is unavailable.
Prepared
Confidence
medium
Sources
3

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.

ATT&CK lookup starting points

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CVE-2021-27887 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

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
2Source 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
6.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N2.14.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.3Medium
CVSS 3.1 vector shape for CVE-2021-27887Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

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
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.