What is CVE-2026-8888?

CVE-2026-8888 is a high-severity vulnerability in Securly, classified under Improper Neutralization of Special Elements used in an Expression Language Statement (Expression Language Injection). CVSS score: 7.5/10. Published 2026-06-03.

How severe is CVE-2026-8888?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Securly

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 p…

Vulnerability class: Log4Shell (CVE-2021-44228)

EPSS: 0.000 (5.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Securly — versions 3.0.7
Securly Chrome Extension — versions 0

Weakness classification (CWE)

References

cret@cert.org (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2026-8888?: CVE-2026-8888 is a high-severity vulnerability in Securly, classified under Improper Neutralization of Special Elements used in an Expression Language Statement (Expression Language Injection). CVSS score: 7.5/10. Published 2026-06-03.
How severe is CVE-2026-8888?: High severity. CVSS v3 base score is 7.5 out of 10.