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CVE Record

CVE-2021-34654: Custom Post Type Relations <= 1.0 Reflected Cross-Site Scripting

The Custom Post Type Relations WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the cptr[name] parameter found in the ~/pages/admin-page.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This affects the Custom Post Type Relations WordPress plugin version 1.0 and earlier. A crafted request can cause a victim’s browser to run attacker-supplied script. Business impact is usually limited, but it can expose data or change page content if an affected user interacts with the malicious link.

Executive priority

Treat as a moderate web application risk. Prioritize internet-facing WordPress sites and sites used by privileged editors or administrators, but this is not supported by the sources as an emergency exploitation event.

Technical view

CVE-2021-34654 is reflected cross-site scripting in the cptr[name] parameter in pages/admin-page.php. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.

Likely exposure

Exposure is likely limited to WordPress sites running Custom Post Type Relations version 1.0 or earlier. The bundle does not identify other affected products or a confirmed fixed version.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. The CVSS vector indicates exploitation requires user interaction, typically persuading someone to open a crafted link or request.

Researcher notes

Evidence is specific to reflected XSS in cptr[name] within pages/admin-page.php. The bundle does not provide exploit telemetry, fixed-version details, or broader product impact. Avoid assuming exploitation beyond the stated user-interaction model.

Mitigation direction

  • Inventory WordPress sites for Custom Post Type Relations installations.
  • Check vendor or WordPress plugin guidance for any fixed release.
  • Upgrade if a vendor-supported fixed version exists.
  • Disable or remove the plugin where it is not required.
  • Restrict administrative access paths where operationally feasible.

Validation and detection

  • Confirm whether Custom Post Type Relations is installed and enabled.
  • Record installed plugin versions and compare against 1.0 or earlier.
  • Review web logs for unusual requests containing cptr[name].
  • Confirm remediation by verifying the vulnerable version is absent.
  • Document any exception where the plugin must remain enabled.
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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-34654 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-2021-34654Attack 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
Custom Post Type RelationsCustom Post Type Relations1.0Listed
Weakness

CWE details

CWE-79

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