Is CVE-2026-33230 in the CISA KEV catalog?

No. CVE-2026-33230 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-33230?

CVE-2026-33230 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2026-33230?

CVE-2026-33230 has an EPSS score of 0.33% (25th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-33230?

Upgrade nltk on ubuntu 14.04 to 2.0~b9-0ubuntu4.1~esm6 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-33230

MEDIUM

6.1

CVSS v3

NVD

Description

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_<payload>` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

nltkUbuntu

Fixed in:2.0~b9-0ubuntu4.1~esm6USN-8302-1

Fixed in:3.1-1ubuntu0.1+esm4USN-8302-1

Fixed in:3.2.5-1ubuntu0.1+esm4USN-8302-1

Fixed in:3.4.5-2ubuntu0.1~esm4USN-8302-1

Fixed in:3.7-1ubuntu0.1~esm2USN-8302-1

Fixed in:3.8.1-1ubuntu0.1~esm2USN-8302-1

python-nltkUbuntu

Fixed in:2.0~b9-0ubuntu4.1~esm6USN-8302-1

Fixed in:3.1-1ubuntu0.1+esm4USN-8302-1

Fixed in:3.2.5-1ubuntu0.1+esm4USN-8302-1

python3-nltkUbuntu

Fixed in:3.1-1ubuntu0.1+esm4USN-8302-1

Fixed in:3.2.5-1ubuntu0.1+esm4USN-8302-1

Fixed in:3.4.5-2ubuntu0.1~esm4USN-8302-1

Fixed in:3.7-1ubuntu0.1~esm2USN-8302-1

Fixed in:3.8.1-1ubuntu0.1~esm2USN-8302-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

0.33%probability of exploitation in 30 days

25thpercentile

Low risk: more likely to be exploited than 25% of all known CVEs.

References

Patch2

Exploit1

github.com

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-23.