CVE-2026-30830Public exploitNetwork attack vector

Cross-site scripting via unescaped image attributes

Published Mar 7, 2026 · Updated Mar 7, 2026

Cross-site scripting in Steph Ango Defuddle before 0.9.0 allows remote attackers to execute script through crafted HTML input. The _findContentBySchemaText method reads a sibling image's raw alt value and interpolates it into an HTML attribute, so a quote creates an onload handler. Exploitation requires schema.org data that reaches this fallback and a downstream application that renders the generated HTML, exposing that application's users to attacker-controlled script.

CVSS severity6.1
Medium
EPSS probability0.25%
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 Steph Ango Defuddle before 0.9.0 allows remote attackers to execute script through crafted HTML input. The _findContentBySchemaText method reads a sibling image's raw alt value and interpolates it into an HTML attribute, so a quote creates an onload handler. Exploitation requires schema.org data that reaches this fallback and a downstream application that renders the generated HTML, exposing that application's users to attacker-controlled script.

The record

CVE
CVE-2026-30830
Published
Mar 7, 2026
Updated
Mar 7, 2026
Vendor
Steph Ango
Product
Defuddle
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 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=< 0.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Steph Ango · Defuddleversion=< 0.9.0

Published CVSS scores

2.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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