Vulnerability-Lookup

GHSA-W3VX-X8FJ-R29M

Vulnerability from github – Published: 2026-03-05 15:30 – Updated: 2026-04-01 15:30

Details

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.

Severity

7.8 (High)


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

8.5 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-27748"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-05T15:16:11Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-w3vx-x8fj-r29m",
  "modified": "2026-04-01T15:30:56Z",
  "published": "2026-03-05T15:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27748"
    },
    {
      "type": "WEB",
      "url": "https://blog.quarkslab.com/avira-deserialize-delete-and-escalate-the-proper-way-to-use-an-av.html"
    },
    {
      "type": "WEB",
      "url": "https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions"
    },
    {
      "type": "WEB",
      "url": "https://www.avira.com/en/internet-security"
    },
    {
      "type": "WEB",
      "url": "https://www.gendigital.com/us/en/contact-us/security-advisories"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/avira-internet-security-arbitrary-file-deletion-via-improper-link-resolution"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-27748 (GCVE-0-2026-27748)

Vulnerability from cvelistv5 – Published: 2026-03-05 14:15 – Updated: 2026-04-01 14:37

Title

Avira Internet Security Arbitrary File Deletion via Improper Link Resolution

Summary

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.

Severity

7.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-06 18:16 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6541 records in the last 180 days details

References

3 references

URL	Tags
https://support.avira.com/hc/en-us/articles/36001…	release-notes
https://www.avira.com/en/internet-security	product
https://www.gendigital.com/us/en/contact-us/secur…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Gen Digital Inc.	Avira Internet Security	Affected: 0 , ≤ 1.1.109.1990 (semver) Unaffected: 1.1.114.3113 (semver) cpe:2.3:a:avira:avira_internet_security_suite::::::windows::*

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JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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