Microsoft Edge is widely deployed; this high-severity privilege escalation could enable broad system compromise across enterprises.
CVE-2026-88077
Integer overflow in Microsoft Edge allows privilege escalation.
Is CVE-2026-88077 being exploited?
Not confirmed. CVE-2026-88077 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-88077?
CVE-2026-88077 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88077?
Yes. A fix has been recorded for CVE-2026-88077. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88077 affect?
CVE-2026-88077 affects Microsoft Edge (Chromium-based). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88077?
Install Microsoft Edge security update immediately and reboot affected hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Network-exploitable integer overflow enabling privilege escalation to compromise user or system accounts via crafted web content.
Immediate action required
- affected>= 1.0.0.0 and < 154.0.4258.62
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.