How severe is CVE-2026-8888?

CVE-2026-8888 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-8888 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-8888?

CVE-2026-8888 affects Securly. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-8888?

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

Does CVE-2026-8888 have an EU (EUVD) identifier?

Yes. CVE-2026-8888 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34168.

When was CVE-2026-8888 published?

CVE-2026-8888 was published on 2026-06-03 and last updated on 2026-06-17.

CVE-2026-8888

CVE-2026-8888 is a high-severity vulnerability in Securly with a CVSS 3.x base score of 7.5. 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-917.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34168
Weakness: CWE-917
Affected product: Securly
Published: 2026-06-03
Last modified: 2026-06-17

Description

Version 3.0.7 of the Securly Chrome Extension downloads config.json over HTTP and compiles server-provided patterns as JavaScript regular expressions via new RegExp() without complexity validation. An on-path attacker can inject specific patterns to cause catastrophic backtracking, resulting in denial of service on all browsing.

Frequently asked questions

What is CVE-2026-8888?: Version 3.0.7 of the Securly Chrome Extension downloads config.json over HTTP and compiles server-provided patterns as JavaScript regular expressions via new RegExp() without complexity validation. An on-path attacker can inject specific patterns to cause catastrophic backtracking, resulting in denial of service on all browsing.
How severe is CVE-2026-8888?: CVE-2026-8888 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-8888 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-8888?: CVE-2026-8888 affects Securly. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-8888?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-8888 have an EU (EUVD) identifier?: Yes. CVE-2026-8888 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34168.
When was CVE-2026-8888 published?: CVE-2026-8888 was published on 2026-06-03 and last updated on 2026-06-17.

References

https://kb.cert.org/vuls/id/595768

Affected products (1)

cpe:2.3:a:securly:securly:3.0.7:*:*:*:*:chrome:*:*

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