CVE-2021-24441

Sign-up Sheets <= 1.0.13 - Authenticated CSV Injection

2021-06-21 00:00

Strategic Overview

Status: Patched in 1.0.14
Affected Plugin: Sign-up Sheets
Affected Version: < 1.0.14
CVSS: 8.0High
Weakness type: CWE-1236 · Improper Neutralization of Formula Elements in a CSV File
CVE: CVE-2021-24441

At a glance

CVE-2021-24441 is a high-severity Improper Neutralization of Formula Elements in a CSV File vulnerability in the Sign-up Sheets WordPress plugin, affecting versions < 1.0.14. It carries a CVSS score of 8.0 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account. The issue is fixed in version 1.0.14; sites on affected versions should update now. Disclosed June 2021, reported by Ajay Sandipan Thorbole.

Vulnerability Overview

The Sign-up Sheets WordPress plugin before 1.0.14 does not not sanitise or validate the Sheet title when generating the CSV to export, which could lead to a CSV injection issue

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-1236: Improper Neutralization of Formula Elements in a CSV File

The product saves user-provided information into a Comma-Separated Value (CSV) file, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as a command when the file is opened by a spreadsheet product.

Remediation

Update to version 1.0.14, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Sign-up Sheets: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Sign-up Sheets 1.0.14 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24441 https://www.wordfence.com/threat-intel/vulnerabilities/id/2f0e19bc-cc1f-4804-ae81-8aa7905ce037 https://nvd.nist.gov/vuln/detail/CVE-2021-24441

Related records

Other vulnerabilities in Sign-up Sheets

CVSS Vector

8.0

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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