CVE-2023-41318Network attack vector

Stored script execution via inline SVG downloads

Published Sep 8, 2023 · Updated Sep 26, 2024

Cross-site scripting in Matrix Media Repo before 1.3.0 allows remote authenticated users to execute JavaScript through downloaded SVG media. The download router treats every image MIME type as safe for inline display, so an uploaded scripted SVG is returned with Content-Disposition set to inline. Exploitation requires another user to follow a direct download link, and deployments that do not share the repository domain with other services are not affected.

CVSS severity4.1
Medium
EPSS probability0.52%
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 Matrix Media Repo before 1.3.0 allows remote authenticated users to execute JavaScript through downloaded SVG media. The download router treats every image MIME type as safe for inline display, so an uploaded scripted SVG is returned with Content-Disposition set to inline. Exploitation requires another user to follow a direct download link, and deployments that do not share the repository domain with other services are not affected.

The record

CVE
CVE-2023-41318
Published
Sep 8, 2023
Updated
Sep 26, 2024
Vendor
t2bot.io
Product
Matrix Media Repo
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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?

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

  1. Affected versionversion=< 1.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

t2bot.io · Matrix Media Repoversion=< 1.3.0

Published CVSS scores

4.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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.

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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