CVE-2021-26256

Survey Maker <= 2.0.6 - Unauthenticated Stored Cross-Site Scripting

2021-12-03 10:28

Strategic Overview

Status: Patched in 2.0.7
Affected Plugin: Survey Maker by AYS
Affected Version: <= 2.0.6
CVSS: 7.2High
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-26256

View all Survey Maker by AYS vulnerabilities

At a glance

CVE-2021-26256 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Survey Maker by AYS WordPress plugin, affecting versions <= 2.0.6. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.0.7; sites on affected versions should update now. Disclosed December 2021, reported by Ngo Van Thien.

Vulnerability Overview

Unauthenticated Stored Cross-Site Scripting (XSS) vulnerability discovered in Survey Maker WordPress plugin (versions <= 2.0.6).

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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Survey Maker by AYS <= 2.0.6 takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Survey Maker by AYS the fix is 2.0.7: builds <= 2.0.6 are affected, anything from 2.0.7 onward is not.

Remediation

Update to version 2.0.7, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Survey Maker by AYS 2.0.7 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-26256 https://www.wordfence.com/threat-intel/vulnerabilities/id/a817c960-37e9-4f72-a2ef-845d9b898d48 https://nvd.nist.gov/vuln/detail/CVE-2021-26256

Related records

Same weakness class

Other vulnerabilities in Survey Maker by AYS

CVSS Vector

7.2

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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