ZDI-26-271: Avast Premium Security Gen Self Protection Driver Exposed Dangerous Function Local Privilege Escalation Vulnerability
Source Zero Day Initiative
Not known to be exploited · fixed in 26.3 : patch affected systems soon.
Data as of 26 May 2026, 20:33 UTC
Rated High by Zero Day Initiative · No CVSS score from NVD or the CNA
- Patch
- Available – fixed in 26.3
Exploitation evidence
Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
AI-suggested
The vulnerability has been fixed in Avast Premium Security version 26.3. Users and administrators should update affected installations to version 26.3 or later to remediate this issue. No additional mitigation steps are indicated by the vendor advisory.
Description
This vulnerability allows local attackers to escalate privileges on affected installations of Avast Premium Security. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-5424.