CVE-2026-8888

CVSS 7.5 HIGHEPSS 0.4%CWE-1333

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

03 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

Securly · Securly Chrome Extension

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References

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