How severe is CVE-2019-11595?

CVE-2019-11595 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-11595 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-11595?

CVE-2019-11595 affects Ublockorigin Ublock Origin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-11595?

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-2019-11595 published?

CVE-2019-11595 was published on 2019-04-29 and last updated on 2026-06-17.

CVE-2019-11595

CVE-2019-11595 is a critical-severity vulnerability in Ublockorigin Ublock Origin with a CVSS 3.x base score of 9.0. 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-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
CVSS v2: 6.8
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Ublockorigin Ublock Origin
Published: 2019-04-29
Last modified: 2026-06-17

Description

In uBlock before 0.9.5.15, the $rewrite filter option allows filter-list maintainers to run arbitrary code in a client-side session when a web service loads a script for execution using XMLHttpRequest or Fetch, and the script origin has an open redirect.

Frequently asked questions

What is CVE-2019-11595?: In uBlock before 0.9.5.15, the $rewrite filter option allows filter-list maintainers to run arbitrary code in a client-side session when a web service loads a script for execution using XMLHttpRequest or Fetch, and the script origin has an open redirect.
How severe is CVE-2019-11595?: CVE-2019-11595 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-11595 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-11595?: CVE-2019-11595 affects Ublockorigin Ublock Origin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-11595?: 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-2019-11595 published?: CVE-2019-11595 was published on 2019-04-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ublockorigin:ublock_origin:*:*:*:*:*:*:*:*

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