CVE-2021-24834Network attack vector

Author-level stored XSS via unsanitized option labels

Published Nov 17, 2021 · Updated Aug 3, 2024

Stored XSS in the Create Poll Options module in YOP Poll before 6.3.1 allows remote authenticated users to run scripts in visitors' browsers. The module stores the vote button label, results link label, and back-to-vote caption without sufficient validation before rendering them in poll pages. Author access is sufficient, and execution requires another user to view the injected content, exposing data and actions available to that user's browser session.

CVSS severity5.4
Medium
EPSS probability1.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the Create Poll Options module in YOP Poll before 6.3.1 allows remote authenticated users to run scripts in visitors' browsers. The module stores the vote button label, results link label, and back-to-vote caption without sufficient validation before rendering them in poll pages. Author access is sufficient, and execution requires another user to view the injected content, exposing data and actions available to that user's browser session.

The record

CVE
CVE-2021-24834
Published
Nov 17, 2021
Updated
Aug 3, 2024
Vendor
YOP
Product
YOP Poll
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=6.3.1 <6.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

YOP · YOP Pollversion=6.3.1 <6.3.1

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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