CVE-2023-2964Public exploitNetwork attack vector

Stored XSS via unvalidated iframeSrc block attribute

Published Jul 10, 2023 · Updated Apr 23, 2025

Stored XSS in unapersona Simple Iframe before 1.2.0 allows remote authenticated users to execute script in viewers' browsers via iframeSrc. The iframeSrc block attribute accepts a data:text/html payload that is emitted as the saved iframe source without sufficient validation or output escaping. Contributor privileges suffice to publish the payload, and its script executes when another user views the stored post.

CVSS severity5.4
Medium
EPSS probability0.54%
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 unapersona Simple Iframe before 1.2.0 allows remote authenticated users to execute script in viewers' browsers via iframeSrc. The iframeSrc block attribute accepts a data:text/html payload that is emitted as the saved iframe source without sufficient validation or output escaping. Contributor privileges suffice to publish the payload, and its script executes when another user views the stored post.

The record

CVE
CVE-2023-2964
Published
Jul 10, 2023
Updated
Apr 23, 2025
Vendor
unapersona
Product
Simple Iframe
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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=0 <1.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

unapersona · Simple Iframeversion=0 <1.2.0

Published CVSS scores

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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