CVE-2026-93505Network attack vectorHinoki check available

Stored XSS via unsanitized large SVG uploads

Published Sep 18, 2026 · Updated Sep 18, 2026

Stored XSS in SveltyCMS 0.0.6 SVG uploads allows remote authenticated users to execute script when another user opens the stored file. The media service sanitized buffered SVGs smaller than 5 MiB but streamed larger SVGs directly to storage, letting script and event handlers bypass sanitizeSvg. Exploitation requires an authenticated media upload and a second user's interaction; successful script execution can modify content in that user's browser context.

CVSS severity5.1
Medium
EPSS probability0.35%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in SveltyCMS 0.0.6 SVG uploads allows remote authenticated users to execute script when another user opens the stored file. The media service sanitized buffered SVGs smaller than 5 MiB but streamed larger SVGs directly to storage, letting script and event handlers bypass sanitizeSvg. Exploitation requires an authenticated media upload and a second user's interaction; successful script execution can modify content in that user's browser context.

The record

CVE
CVE-2026-93505
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
SveltyCMS
Product
SveltyCMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=0.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SveltyCMS · SveltyCMSversion=0.0.6

Published CVSS scores

5.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.5VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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