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CVE Record

CVE-2021-24320: Bello < 1.6.0 - Unauthenticated Reflected XSS & XFS

The Bello - Directory & Listing WordPress theme before 1.6.0 did not properly sanitise and escape its listing_list_view, bt_bb_listing_field_my_lat, bt_bb_listing_field_my_lng, bt_bb_listing_field_distance_value, bt_bb_listing_field_my_lat_default, bt_bb_listing_field_keyword, bt_bb_listing_field_location_autocomplete, bt_bb_listing_field_price_range_from and bt_bb_listing_field_price_range_to parameter in ints listing page, leading to reflected Cross-Site Scripting issues.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-24320 affects the Bello Directory & Listing WordPress theme before 1.6.0. A public visitor could supply crafted listing-page parameters that are reflected without proper sanitization, creating a browser-side script risk for users who open a malicious link.

Executive priority

Treat this as a targeted web risk, not an emergency. Prioritize internet-facing WordPress sites using Bello before 1.6.0, because exploitation could affect visitors, sessions, or brand trust.

Technical view

The theme failed to sanitize and escape multiple listing page parameters, including view, latitude, longitude, keyword, location autocomplete, distance, and price range fields. The reported issue is unauthenticated reflected cross-site scripting and cross-frame scripting, mapped to CWE-79.

Likely exposure

Exposure is limited to WordPress sites using the Bello Directory & Listing theme before 1.6.0, especially sites with public listing search pages reachable by unauthenticated users.

Exploitation context

The source bundle includes public vulnerability references, but KEV is false and no cited source here confirms active exploitation. Reflected XSS generally requires a target to open a crafted URL or page path.

Researcher notes

Evidence is strongest for reflected XSS from unsanitized listing parameters in Bello before 1.6.0. The bundle does not provide CVSS, confirmed exploitation, or detailed vendor advisory text, so validation should focus on version inventory and exposure.

Mitigation direction

  • Identify all WordPress sites using the Bello theme.
  • Upgrade Bello to 1.6.0 or later where vendor guidance confirms the fix.
  • Temporarily disable or replace the theme if upgrading is not available.
  • Check vendor and WPScan guidance for any additional remediation notes.

Validation and detection

  • Confirm the installed Bello theme version on each WordPress site.
  • Verify public listing pages exist and accept the named parameters.
  • Review update records to confirm affected sites reached a fixed version.
  • Check web logs for unusual listing-page requests using those parameters.
Prepared
Confidence
medium
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-2021-24320 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

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

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
BoldThemesBello - Directory & Listing1.6.0Listed
Weakness

CWE details

CWE-79

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

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs