CVE-2020-37019Public exploitNetwork attack vectorHinoki check available

Stored XSS via unsanitized Markdown blog content

Published Jan 30, 2026 · Updated Jan 30, 2026

Stored XSS in Orchard Core 1.0 allows remote authenticated users to execute scripts in visitors' browsers through crafted blog posts. The MarkdownBodyPart.Source field accepts raw script markup during blog-post creation and publishes it without default sanitization. Content-editor access is required, and viewing the published post executes the stored script in each visitor's Orchard Core session.

CVSS severity6.4
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Orchard Core 1.0 allows remote authenticated users to execute scripts in visitors' browsers through crafted blog posts. The MarkdownBodyPart.Source field accepts raw script markup during blog-post creation and publishes it without default sanitization. Content-editor access is required, and viewing the published post executes the stored script in each visitor's Orchard Core session.

The record

CVE
CVE-2020-37019
Published
Jan 30, 2026
Updated
Jan 30, 2026
Vendor
Orchard Core
Product
Orchard Core
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 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=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Orchard Core · Orchard Coreversion=1.0

Published CVSS scores

6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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