CVE-2026-10850Public exploitNetwork attack vector

Stored XSS via unsanitized intake description

Published Jun 17, 2026 · Updated Jun 17, 2026

Stored XSS in Plane CE 1.3.1 allows remote authenticated users to execute JavaScript in a reviewer's browser via an intake work item. The API v1 intake creation path writes description_html directly to Issue.description_html, bypassing IssueSerializer.validate() and its nh3 sanitizer. Guest-level project membership and an API token suffice; execution occurs when another user reviews the stored item, exposing data or actions available in that session.

CVSS severity6.9
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Plane CE 1.3.1 allows remote authenticated users to execute JavaScript in a reviewer's browser via an intake work item. The API v1 intake creation path writes description_html directly to Issue.description_html, bypassing IssueSerializer.validate() and its nh3 sanitizer. Guest-level project membership and an API token suffice; execution occurs when another user reviews the stored item, exposing data or actions available in that session.

The record

CVE
CVE-2026-10850
Published
Jun 17, 2026
Updated
Jun 17, 2026
Vendor
Plane
Product
Plane
Classifications
CWE-79, CAPEC-592, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Plane · Planeversion=1.3.1

Published CVSS scores

6.9Fluid AttacksCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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