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CVE Record

CVE-2021-39428: Cross Site Scripting (XSS) vulnerability in Users.php in eyoucms 1.5.4 allows remote attackers to run arbit...

Cross Site Scripting (XSS) vulnerability in Users.php in eyoucms 1.5.4 allows remote attackers to run arbitrary code and gain escalated privilege via the filename for edit_users_head_pic.

MediumCVSS 5.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-39428 is a stored or reflected XSS issue reported in eyoucms 1.5.4. A crafted filename in the user profile picture edit flow could let an attacker run script in another user’s browser and potentially gain higher privileges.

Executive priority

Schedule remediation in the normal vulnerability cycle, faster for internet-facing administrative portals or sites with untrusted users. The issue is moderate, but privilege escalation through browser-side script can create business impact if administrators are targeted.

Technical view

The CVE describes CWE-79 in Users.php, specifically the edit_users_head_pic filename handling path. CVSS 3.1 is 5.4 with network access, low complexity, low privileges required, user interaction required, changed scope, and low confidentiality/integrity impact.

Likely exposure

Exposure appears limited to eyoucms 1.5.4 deployments using the affected user profile picture edit functionality. The provided CVE metadata does not list formal CPEs or broader affected versions.

Exploitation context

The source bundle provides a public GitHub issue reference but no KEV listing and no cited evidence of active exploitation. Treat this as publicly disclosed and potentially reproducible, not as confirmed exploited in the wild.

Researcher notes

Affected product metadata is incomplete in the provided CVE record, but the title, description, and reference identify eyoucms 1.5.4. Do not assume other versions are affected without vendor or maintainer confirmation.

Mitigation direction

  • Check eyoucms vendor guidance and release notes for a fixed version.
  • Upgrade away from eyoucms 1.5.4 if a vendor-supported fix exists.
  • Restrict access to affected user profile image editing where feasible.
  • Ensure filenames are sanitized and safely encoded before display.
  • Review WAF or application rules for XSS attempts as compensating control.

Validation and detection

  • Inventory public and internal sites running eyoucms 1.5.4.
  • Confirm whether Users.php and edit_users_head_pic are present and reachable.
  • Review profile image filename handling for output encoding gaps.
  • Check application logs for suspicious profile image filename values.
  • Verify no source cited here confirms active exploitation.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-39428 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
5.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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
5.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N2.32.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.4Medium
CVSS 3.1 vector shape for CVE-2021-39428Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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

CWE-79

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