CVE-2020-27406Public exploitNetwork attack vector

Stored XSS via unescaped group name

Published Nov 2, 2021 · Updated Jul 9, 2026

Stored cross-site scripting in DynPG 4.9.1 allows remote authenticated users to execute JavaScript through a crafted group name. The Texts group-creation handler accepts NEW_GROUP_NAME at POST /index.php?show=4 and renders the stored value as executable markup. An authenticated admin-panel session and a subsequent page view are required; code runs in the viewer's browser context.

CVSS severity5.4
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

Stored cross-site scripting in DynPG 4.9.1 allows remote authenticated users to execute JavaScript through a crafted group name. The Texts group-creation handler accepts NEW_GROUP_NAME at POST /index.php?show=4 and renders the stored value as executable markup. An authenticated admin-panel session and a subsequent page view are required; code runs in the viewer's browser context.

The record

CVE
CVE-2020-27406
Published
Nov 2, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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