CVE-2021-39327

BulletProof Security <= 5.1 - Sensitive Information Disclosure

2021-09-16 15:36

Strategic Overview

Status: Patched in 5.2
Affected Plugin: BulletProof Security
Affected Version: <= 5.1
CVSS: 5.3Medium
Weakness type: CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
CVE: CVE-2021-39327

View all BulletProof Security vulnerabilities

At a glance

CVE-2021-39327 is a medium-severity Exposure of Sensitive Information to an Unauthorized Actor vulnerability in the BulletProof Security WordPress plugin, affecting versions <= 5.1. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 5.2; sites on affected versions should update now. Disclosed September 2021, reported by Vincent Rakotomanga.

Vulnerability Overview

The BulletProof Security WordPress plugin is vulnerable to sensitive information disclosure due to a file path disclosure in the publicly accessible ~/db_backup_log.txt file which grants attackers the full path of the site, in addition to the path of database backup files. This affects versions up to, and including, 5.1.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Reaching this weakness in BulletProof Security <= 5.1 takes a caller who can reach the endpoint. Sensitive information exposure means data the application intended to keep internal is returned to a caller who should not be able to see it.

The disclosed data — credentials, tokens, customer records or internal paths — is usually worth more as material for a follow-up attack than as an end in itself. For BulletProof Security the fix is 5.2: builds <= 5.1 are affected, anything from 5.2 onward is not.

Remediation

Update to version 5.2, or a newer patched version

How does WordSec protect against this?

The fix is the thing that ends this: BulletProof Security 5.2 closes this, and updating the plugin is the step that ends it.

Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-39327 https://www.wordfence.com/threat-intel/vulnerabilities/id/4735c491-9595-42b8-bb1c-1b18c89fcf7a https://nvd.nist.gov/vuln/detail/CVE-2021-39327

Related records

Same weakness class

5.3CVE-2025-67931: BulletProof Security <= 6.9 Info ExposureCVE-2025-67931

Other vulnerabilities in BulletProof Security

CVSS Vector

5.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityNone

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