What is CVE-2026-10850?

CVE-2026-10850 is a medium-severity vulnerability in Plane, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-06-17.

How severe is CVE-2026-10850?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Plane

CVE-2026-10850

Plane CE 1.3.1 allows a low-privileged project member to submit arbitrary HTML/JS in the description_html field when creating an intake work item through the API v1 intake endpoint.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-06-17 · last modified 2026-06-23.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (5.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Plane — versions 1.3.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

fluidattacks.com/es/advisories/earth (Exploit, Third Party Advisory, third-party-advisory)
github.com/makeplane/plane (Product, product)

Frequently asked questions

What is CVE-2026-10850?: CVE-2026-10850 is a medium-severity vulnerability in Plane, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-06-17.
How severe is CVE-2026-10850?: Medium severity. CVSS v3 base score is 5.4 out of 10.