CVE-2021-47157Network attack vector

Cross-origin JSON disclosure via missing header enforcement

Published Mar 18, 2024 · Updated Nov 25, 2024

JSON hijacking in the Kossy Perl framework before 0.60 allows remote attackers to read application JSON responses cross-origin. The render_json path fails to reject cookie-bearing GET requests from Android user agents when X-Requested-With is absent, allowing cross-origin script requests to receive JSON. Exposure is limited to Kossy applications that return sensitive JSON through render_json to browser sessions with cookies.

CVSS severity9.8
Critical
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

JSON hijacking in the Kossy Perl framework before 0.60 allows remote attackers to read application JSON responses cross-origin. The render_json path fails to reject cookie-bearing GET requests from Android user agents when X-Requested-With is absent, allowing cross-origin script requests to receive JSON. Exposure is limited to Kossy applications that return sensitive JSON through render_json to browser sessions with cookies.

The record

CVE
CVE-2021-47157
Published
Mar 18, 2024
Updated
Nov 25, 2024
Vendor
ApusWP
Product
Kossy - Minimalist eCommerce WordPress Theme
Classifications
CWE-346, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.60

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ApusWP · Kossy - Minimalist eCommerce WordPress Themeversion=0 <0.60

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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