How severe is CVE-2023-26119?

CVE-2023-26119 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-26119 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26119?

CVE-2023-26119 affects Htmlunit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26119?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-26119 published?

CVE-2023-26119 was published on 2023-04-03 and last updated on 2026-06-17.

CVE-2023-26119

CVE-2023-26119 is a critical-severity vulnerability in Htmlunit with a CVSS 3.x base score of 9.8. 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-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Htmlunit
Published: 2023-04-03
Last modified: 2026-06-17

Description

Versions of the package net.sourceforge.htmlunit:htmlunit from 0 and before 3.0.0 are vulnerable to Remote Code Execution (RCE) via XSTL, when browsing the attacker’s webpage.

Frequently asked questions

What is CVE-2023-26119?: Versions of the package net.sourceforge.htmlunit:htmlunit from 0 and before 3.0.0 are vulnerable to Remote Code Execution (RCE) via XSTL, when browsing the attacker’s webpage.
How severe is CVE-2023-26119?: CVE-2023-26119 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-26119 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26119?: CVE-2023-26119 affects Htmlunit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26119?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-26119 published?: CVE-2023-26119 was published on 2023-04-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:htmlunit:htmlunit:*:*:*:*:*:*:*:*

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