# CVE-2021-26718: Security feature bypass in Kaspersky Internet Security for Mac

> An attacker can bypass anti-virus protection in Kaspersky Internet Security for macOS, potentially disabling security features.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-cr93-c4mw-5cqx

## What is CVE-2021-26718?

CVE-2021-26718 is a medium-severity vulnerability in Kaspersky Internet Security for Mac, published on 1 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

KIS for macOS in some use cases was vulnerable to AV bypass that potentially allowed an attacker to disable anti-virus protection.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2021-26718?

It affects 1 product.


Products: Kaspersky Internet Security.

## How do I fix CVE-2021-26718?

No fix has been published for CVE-2021-26718 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26718 being exploited?

There is no known exploitation of CVE-2021-26718 in the wild and no public exploit code.

## Other vulnerabilities in Kaspersky Internet Security for Mac

- [CVE-2017-12816](https://insights.sbomify.com/CVE-2017-12816/): Missing authorization in Kaspersky Lab Kaspersky Internet Security for Android 11.12.4.1622 (critical 9.8)
- [CVE-2017-12817](https://insights.sbomify.com/CVE-2017-12817/): Information disclosure in Kaspersky Lab Kaspersky Internet Security for Android 11.12.4.1622 (high 7.5)
- [CVE-2016-4304](https://insights.sbomify.com/CVE-2016-4304/): Denial of service in Internet Security (medium 5.5)
- [CVE-2016-4305](https://insights.sbomify.com/CVE-2016-4305/): Denial of service in Internet Security (medium 5.5)
- [CVE-2016-4307](https://insights.sbomify.com/CVE-2016-4307/): Denial of service in Internet Security (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26718 and fix it if it is affected.

What it is: CVE-2021-26718 is a medium-severity vulnerability in Kaspersky Internet Security for Mac, published on 1 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-26718 in the wild and no public exploit code.

Affected product: Kaspersky Internet Security for Mac. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-26718/ (Markdown: https://insights.sbomify.com/CVE-2021-26718/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26718
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26718
- OSV: https://osv.dev/vulnerability/CVE-2021-26718

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26718/
Summaries are generated and may contain mistakes; the official description above is the record.