CVE-2025-55420Public exploitNetwork attack vector

Arbitrary JavaScript execution via unsanitized GET reflection

Published Aug 21, 2025 · Updated Aug 21, 2025

Reflected XSS in FoxCMS 1.2.6 allows remote attackers to execute arbitrary JavaScript through a crafted GET request to /index.php. The endpoint reflects attacker-controlled GET input into the HTML response without sanitization or context-appropriate output encoding. Exploitation requires a logged-in user to submit the crafted input, after which the script runs in that user’s browser context.

CVSS severity8.8
High
EPSS probability0.49%
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 FoxCMS 1.2.6 allows remote attackers to execute arbitrary JavaScript through a crafted GET request to /index.php. The endpoint reflects attacker-controlled GET input into the HTML response without sanitization or context-appropriate output encoding. Exploitation requires a logged-in user to submit the crafted input, after which the script runs in that user’s browser context.

The record

CVE
CVE-2025-55420
Published
Aug 21, 2025
Updated
Aug 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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?

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

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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-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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