CVE-2026-10850: Plane CE 1.3.1 allows a low-privileged project member to submit arbitrary HTML/JS in the description_html fiel

Routine

MEDIUM 5.4DOWNGRADE

CVE-2026-10850 is a medium-severity flaw (CVSS 5.4) affecting plane. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-17
Last modified	2026-06-23

Publisher (CNA): Fluid Attacks · Vendor: plane

Last updated 2026-06-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 15:16 UTCPublished CVE record published
2026-06-23 14:47 UTCUpdated Record last modified

plane plane DOWNGRADE

Affected: 1.3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.1

1. Check installed version

apt-cache policy plane || rpm -q plane || plane --version

2. No fixed release: DOWNGRADE to a release before 1.3.1 (Debian / Ubuntu)

apt-cache madison plane sudo apt install plane=<VERSION_BEFORE_1.3.1> sudo apt-mark hold plane

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list plane sudo dnf downgrade plane-<VERSION_BEFORE_1.3.1> sudo dnf versionlock add plane

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-10850?

plane: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-10850 being exploited?

CVE-2026-10850 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-10850 affect?

CVE-2026-10850 affects plane. Severity is medium (CVSS 5.4). 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.

How urgent is CVE-2026-10850?

Priority 25/100. Public exploit reference

Related CVEs

CVE-2026-46558 HIGH 8.3 UPGRADE Plane is an open-source project management tool
CVE-2026-39843 HIGH 7.7 UPGRADE Plane is an an open-source project management tool

References

← Back to latest CVEs