CVE-2025-0817Network attack vector

Unauthenticated stored XSS via unsafe SVG uploads

Published Feb 18, 2025 · Updated Apr 8, 2026

Stored XSS in Subtle Web Inc FormCraft 3.9.11 and earlier allows remote attackers to inject scripts through SVG file uploads. The SVG upload path accepts attacker-controlled active content without sufficient sanitization, and the file-serving path returns it without output escaping. No authentication is required to upload the file; script execution occurs when a user opens the uploaded SVG, exposing browser-session data and allowing page content modification.

CVSS severity7.2
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Subtle Web Inc FormCraft 3.9.11 and earlier allows remote attackers to inject scripts through SVG file uploads. The SVG upload path accepts attacker-controlled active content without sufficient sanitization, and the file-serving path returns it without output escaping. No authentication is required to upload the file; script execution occurs when a user opens the uploaded SVG, exposing browser-session data and allowing page content modification.

The record

CVE
CVE-2025-0817
Published
Feb 18, 2025
Updated
Apr 8, 2026
Vendor
Subtle Web Inc
Product
FormCraft
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.9.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Subtle Web Inc · FormCraftversion=0 <=3.9.11

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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.

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Technologies

Your stack

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Your stack

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