CVE-2025-46655Public exploitNetwork attack vector

Stored XSS via cross-origin SVG hosting

Published Apr 26, 2025 · Updated Apr 29, 2025

Stored XSS in HackMD CodiMD 2.5.4 and earlier allows remote authenticated users to run JavaScript through uploaded SVG files. The upload route accepts SVG images, while external storage such as S3 serves them without the CSP response header added by CodiMD. Exploitation requires an upload-capable account on 2.2.1 through 2.5.4 and different-origin storage; versions 2.2.0 and earlier expose broader unauthenticated upload paths.

CVSS severity4.9
Medium
EPSS probability0.24%
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 HackMD CodiMD 2.5.4 and earlier allows remote authenticated users to run JavaScript through uploaded SVG files. The upload route accepts SVG images, while external storage such as S3 serves them without the CSP response header added by CodiMD. Exploitation requires an upload-capable account on 2.2.1 through 2.5.4 and different-origin storage; versions 2.2.0 and earlier expose broader unauthenticated upload paths.

The record

CVE
CVE-2025-46655
Published
Apr 26, 2025
Updated
Apr 29, 2025
Vendor
HackMD
Product
CodiMD
Classifications
CWE-424
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 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?

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

  1. Affected versionversion=0 <=2.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HackMD · CodiMDversion=0 <=2.5.4

Published CVSS scores

4.9MITRECVSS:3.1/AV:N/AC:H/PR:L/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.

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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-424Improper Protection of Alternate Path

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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