How severe is CVE-2026-30830?

CVE-2026-30830 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-30830 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30830?

CVE-2026-30830 affects Kepano Defuddle. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-30830?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-30830 have an EU (EUVD) identifier?

Yes. CVE-2026-30830 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10118.

When was CVE-2026-30830 published?

CVE-2026-30830 was published on 2026-03-07 and last updated on 2026-06-17.

CVE-2026-30830

CVE-2026-30830 is a medium-severity vulnerability in Kepano Defuddle with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 2.1
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10118
Weakness: CWE-79
Affected product: Kepano Defuddle
Published: 2026-03-07
Last modified: 2026-06-17

Description

Defuddle cleans up HTML pages. Prior to version 0.9.0, the _findContentBySchemaText method in src/defuddle.ts interpolates image src and alt attributes directly into an HTML string without escaping. An attacker can use a " in the alt attribute to break out of the attribute context and inject event handler. This issue has been patched in version 0.9.0.

Frequently asked questions

What is CVE-2026-30830?: Defuddle cleans up HTML pages. Prior to version 0.9.0, the _findContentBySchemaText method in src/defuddle.ts interpolates image src and alt attributes directly into an HTML string without escaping. An attacker can use a " in the alt attribute to break out of the attribute context and inject event handler. This issue has been patched in version 0.9.0.
How severe is CVE-2026-30830?: CVE-2026-30830 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-30830 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30830?: CVE-2026-30830 affects Kepano Defuddle. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-30830?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-30830 have an EU (EUVD) identifier?: Yes. CVE-2026-30830 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10118.
When was CVE-2026-30830 published?: CVE-2026-30830 was published on 2026-03-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kepano:defuddle:*:*:*:*:*:node.js:*:*

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