CVE-2021-45380Public exploitNetwork attack vector

Browser script execution via unencoded search query

Published Jan 23, 2022 · Updated Aug 4, 2024

Cross-site scripting in AppCMS 2.0.101 allows remote attackers to execute script in a user's browser through a crafted search query. The templates/m/inc_head.php file writes the q GET parameter directly into an HTML input value without filtering or output encoding, so a quote can close the attribute and introduce a script element. Exploitation requires a user to open the crafted URL; the script runs in the AppCMS origin and can read or alter browser-accessible content.

CVSS severity6.1
Medium
EPSS probability2.53%
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 AppCMS 2.0.101 allows remote attackers to execute script in a user's browser through a crafted search query. The templates/m/inc_head.php file writes the q GET parameter directly into an HTML input value without filtering or output encoding, so a quote can close the attribute and introduce a script element. Exploitation requires a user to open the crafted URL; the script runs in the AppCMS origin and can read or alter browser-accessible content.

The record

CVE
CVE-2021-45380
Published
Jan 23, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2022CVE 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

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV: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 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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