CVE-2020-13563Public exploitNetwork attack vector

Arbitrary JavaScript execution via unescaped group_id

Published Feb 1, 2021 · Updated Aug 4, 2024

Cross-site scripting in phpGACL 3.3.7 allows remote attackers to execute arbitrary JavaScript through a crafted group_id URL. The assign_group.php path copies the GET group_id value into Smarty output, where templates render it verbatim in a hidden field and pager link. Exploitation requires a user to open the crafted URL, allowing script execution in that user's browser context.

CVSS severity6.1
Medium
EPSS probability75.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in phpGACL 3.3.7 allows remote attackers to execute arbitrary JavaScript through a crafted group_id URL. The assign_group.php path copies the GET group_id value into Smarty output, where templates render it verbatim in a hidden field and pager link. Exploitation requires a user to open the crafted URL, allowing script execution in that user's browser context.

The record

CVE
CVE-2020-13563
Published
Feb 1, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-80, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
9.6Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
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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