CVE-2025-66403Public exploitNetwork attack vector

Stored XSS via unsanitized inline SVG preview

Published Dec 1, 2025 · Updated Dec 2, 2025

Stored XSS in FileRise before 2.2.3 allows remote authenticated users to execute JavaScript through an uploaded SVG viewed in the app. The file-list and preview interfaces render uploaded SVG content inline without sanitizing embedded scripts or event handlers. A user with upload access must store the file and another user must view it, after which the script runs in the FileRise origin and can access session data or alter interface content.

CVSS severity4.6
Medium
EPSS probability0.21%
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 FileRise before 2.2.3 allows remote authenticated users to execute JavaScript through an uploaded SVG viewed in the app. The file-list and preview interfaces render uploaded SVG content inline without sanitizing embedded scripts or event handlers. A user with upload access must store the file and another user must view it, after which the script runs in the FileRise origin and can access session data or alter interface content.

The record

CVE
CVE-2025-66403
Published
Dec 1, 2025
Updated
Dec 2, 2025
Vendor
error311
Product
FileRise
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 2.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

error311 · FileRiseversion=< 2.2.3

Published CVSS scores

4.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002User Execution: Malicious File

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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