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CVE-2026-104979

8.7 · HIGH

Plane is an open-source project management tool.

Published Oct 5, 2026CWE-79EPSS 0.36%

Overview

CVE-2026-104979 is a high-severity vulnerability. It was published on October 5, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Plane is an open-source project management tool. Prior to 1.4.0, IntakeIssuePublicViewSet.create in Plane v1.3.1 writes description_html through Issue.objects.create(...) without calling validate_html_content from nh3. Any authenticated user, including a new user with no workspace memberships, can plant arbitrary HTML in a project that has a published DeployBoard with intake enabled. When a project member or viewer of a closed intake item clicks the planted link, the TipTap \tjavascript: parser bypass and the target="_self" click handler execute JavaScript in the viewer's session and exfiltrate a long-lived API token. This issue is fixed in 1.4.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/makeplane/plane/commit/0d58adb69d859fc94c43b9d68fadd77e810d5ed1GitHubgithub.com/makeplane/plane/pull/9287GitHubgithub.com/makeplane/plane/releases/tag/v1.4.0GitHubgithub.com/makeplane/plane/security/advisories/GHSA-hh2r-3hwp-mvq3GitHubgithub.com/makeplane/plane/security/advisories/GHSA-hh2r-3hwp-mvq3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-104979?

CVE-2026-104979 is a high-severity vulnerability. It was published on October 5, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

How severe is CVE-2026-104979?

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-104979?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-104979?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-104979 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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