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CVE Record

CVE-2021-38330: Yet Another bol.com Plugin <= 1.4 Reflected Cross-Site Scripting

The Yet Another bol.com Plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to a reflected $_SERVER["PHP_SELF"] value in the ~/yabp.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.4.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a reflected cross-site scripting issue in a WordPress plugin. An attacker could trick a user into opening a crafted link that causes script to run in that user’s browser. Business impact is usually session, content, or trust abuse, not server takeover.

Executive priority

Handle in normal vulnerability remediation cycles unless the plugin is on sensitive or high-traffic WordPress sites. Prioritize removal where the plugin is unused, unsupported, or exposed to privileged users.

Technical view

Yet Another bol.com Plugin versions up to and including 1.4 reflect the PHP_SELF server value in yabp.php without safe output handling, creating CWE-79 reflected XSS. CVSS 3.1 is 6.1, network reachable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact.

Likely exposure

Exposure is limited to WordPress sites with Yet Another bol.com Plugin installed and active at version 1.4 or earlier. Public-facing WordPress admin or plugin surfaces increase phishing usefulness, but the sources do not identify affected deployment counts.

Exploitation context

The provided sources do not report active exploitation, and this CVE is not marked KEV. Exploitation requires user interaction, typically convincing a victim to open a crafted request that reflects script through the vulnerable plugin path.

Researcher notes

Evidence identifies the vulnerable file and reflected source but does not provide a named fixed version in the bundle. Treat remediation guidance as conditional on vendor availability, and avoid assuming broader products are affected.

Mitigation direction

  • Inventory WordPress sites for Yet Another bol.com Plugin installations.
  • Remove or disable plugin versions 1.4 or earlier if no maintained fix exists.
  • Check vendor or WordPress plugin guidance for any patched release.
  • Restrict administrative access and harden WordPress session protections.
  • Use web security controls to reduce reflected script execution risk.

Validation and detection

  • Confirm whether the plugin is installed, active, and at version 1.4 or earlier.
  • Review yabp.php handling of reflected PHP_SELF output after any update.
  • Check web logs for unusual requests targeting plugin pages with encoded script-like input.
  • Verify affected sites no longer expose the vulnerable plugin version.
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.

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.

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cve · low confidence lookup

CVE-2021-38330 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/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
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
6.1CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.1Medium
CVSS 3.1 vector shape for CVE-2021-38330Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/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
Yet Another bol.com PluginYet Another bol.com Plugin1.4Listed
Weakness

CWE details

CWE-79

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