CVE-2021-24454Public exploitNetwork attack vector

Unauthenticated browser script execution via unsanitized Other answers

Published Jul 12, 2021 · Updated Aug 3, 2024

Stored XSS in YOP Poll before 6.2.8 allows remote attackers to run script in visitors' browsers through a crafted Other answer. The plugin stores the voter-supplied Other answer without sanitizing it before inserting the value into a results page. Exploitation requires an affected poll to allow and display Other answers and to expose results; viewing those results executes the payload in a visitor's browser.

CVSS severity6.1
Medium
EPSS probability1.59%
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 YOP Poll before 6.2.8 allows remote attackers to run script in visitors' browsers through a crafted Other answer. The plugin stores the voter-supplied Other answer without sanitizing it before inserting the value into a results page. Exploitation requires an affected poll to allow and display Other answers and to expose results; viewing those results executes the payload in a visitor's browser.

The record

CVE
CVE-2021-24454
Published
Jul 12, 2021
Updated
Aug 3, 2024
Vendor
YOP
Product
YOP Poll
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 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=6.2.8 <6.2.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

YOP · YOP Pollversion=6.2.8 <6.2.8

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

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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