What’s Vulnerable › Vulnerabilities

CVE-2026-86174: Plane through 1.4.2 Arbitrary Comment Write via Public Deploy Board

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-05 · updated 2026-09-16
• Weakness: CWE-639

Description

Plane through 1.4.2 fails to validate that issues belong to the deploy board's project in the public comment endpoint. Authenticated attackers can post comments to arbitrary issues across workspaces by supplying an issue_id parameter to the public deploy-board comment endpoint.

Affected products

• makeplane plane: through 1.4.2

References

• https://github.com/makeplane/plane
• https://github.com/makeplane/plane/blob/v1.4.2/apps/api/plane/space/views/issue.py#L258-L275
• https://github.com/makeplane/plane/issues/9441
• https://www.vulncheck.com/advisories/plane-through-1.4.2-arbitrary-comment-write-via-public-deploy-board

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