CVE-2021-39313Network attack vector

Reflected script execution via unescaped msg parameter

Published Dec 14, 2021 · Updated Jan 31, 2025

Reflected XSS in DuoGeek Simple Image Gallery 1.0.6 and earlier allows remote attackers to run scripts via a crafted msg parameter. simple-image-gallery.php reflects the msg request value into an HTML response without neutralizing script-capable content; this code belongs to DuoGeek's WordPress plugin, not JoomlaWorks' Joomla extension. Exploitation requires a user to open an attacker-crafted URL, after which the injected script executes in that site's browser context.

CVSS severity6.1
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in DuoGeek Simple Image Gallery 1.0.6 and earlier allows remote attackers to run scripts via a crafted msg parameter. simple-image-gallery.php reflects the msg request value into an HTML response without neutralizing script-capable content; this code belongs to DuoGeek's WordPress plugin, not JoomlaWorks' Joomla extension. Exploitation requires a user to open an attacker-crafted URL, after which the injected script executes in that site's browser context.

The record

CVE
CVE-2021-39313
Published
Dec 14, 2021
Updated
Jan 31, 2025
Vendor
JoomlaWorks
Product
Simple Image Gallery
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Jan 31, 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=1.0.6 <=1.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JoomlaWorks · Simple Image Galleryversion=1.0.6 <=1.0.6

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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