How severe is CVE-2026-27748?

CVE-2026-27748 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-27748 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27748?

CVE-2026-27748 affects Avira Internet Security. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27748?

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-2026-27748 have an EU (EUVD) identifier?

Yes. CVE-2026-27748 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9820.

When was CVE-2026-27748 published?

CVE-2026-27748 was published on 2026-03-05 and last updated on 2026-06-17.

CVE-2026-27748

CVE-2026-27748 is a high-severity vulnerability in Avira Internet Security with a CVSS 3.x base score of 7.8. 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-59.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9820
Weakness: CWE-59
Affected product: Avira Internet Security
Published: 2026-03-05
Last modified: 2026-06-17

Description

Avira Internet Security contains an improper link resolution vulnerability in the Software Updater component. During the update process, a privileged service running as SYSTEM deletes a file under C:\\ProgramData without validating whether the path resolves through a symbolic link or reparse point. A local attacker can create a malicious link to redirect the delete operation to an arbitrary file, resulting in deletion of attacker-chosen files with SYSTEM privileges. This may lead to local privilege escalation, denial of service, or system integrity compromise depending on the targeted file and operating system configuration.

Frequently asked questions

What is CVE-2026-27748?: Avira Internet Security contains an improper link resolution vulnerability in the Software Updater component. During the update process, a privileged service running as SYSTEM deletes a file under C:\\ProgramData without validating whether the path resolves through a symbolic link or reparse point. A local attacker can create a malicious link to redirect the delete operation to an arbitrary file, resulting in deletion of attacker-chosen files with SYSTEM privileges. This may lead to local privilege escalation, denial of service, or system integrity compromise depending on the targeted file and operating system configuration.
How severe is CVE-2026-27748?: CVE-2026-27748 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-27748 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27748?: CVE-2026-27748 affects Avira Internet Security. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27748?: 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-2026-27748 have an EU (EUVD) identifier?: Yes. CVE-2026-27748 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9820.
When was CVE-2026-27748 published?: CVE-2026-27748 was published on 2026-03-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:avira:internet_security:*:*:*:*:*:windows:*:*

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