Plane CE
CVE-2026-10850
MEDIUM
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Stored XSS crosses browser security boundary (S:C); session token theft justifies C:H; PR:L reflects mandatory project member authentication; UI:R for victim view.
Primary rating from Vendor (Fluid Attacks).
CVSS VectorVendor: Fluid Attacks
Lifecycle Timeline
1DescriptionCVE.org
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.
AnalysisAI
Stored cross-site scripting in Plane CE 1.3.1 allows an authenticated low-privileged project member to inject arbitrary HTML and JavaScript via the description_html field through the API v1 intake endpoint, with payloads persisting in the database and executing in the browsers of any user who views the affected intake item. The CVSS 4.0 vector rates confidentiality impact on the vulnerable system as High (VC:H), reflecting the realistic threat of session token exfiltration from higher-privileged users such as project administrators. No active exploitation has been confirmed and no public exploit code has been identified at time of analysis.
Technical ContextAI
Plane CE (Community Edition) is an open-source project management platform; the affected component is its REST API v1 intake endpoint, which allows project members to submit intake work items with rich-text content via the description_html field. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation - Cross-site Scripting): the application fails to sanitize or encode HTML and JavaScript submitted through this field before persisting it to the database and later rendering it in user browsers. This is a stored XSS variant, meaning the payload is written once and executes for every user who subsequently views the poisoned intake item, amplifying its impact over reflected XSS. The affected CPE is cpe:2.3:a:plane:plane:*:*:*:*:*:*:*:*, with version 1.3.1 explicitly confirmed in the vulnerability description.
RemediationAI
No vendor-released patch version has been independently confirmed from the available data - the GitHub repository reference (https://github.com/makeplane/plane) does not point to a tagged patched release, and no fix version is stated in the advisory or NVD entry. Organizations should monitor the Fluid Attacks advisory at https://fluidattacks.com/es/advisories/earth and the upstream repository for patch releases. As a compensating control, restrict network access to the Plane API v1 intake endpoint to trusted internal networks or VPN-authenticated sessions, limiting the pool of potential attackers; note this does not mitigate insider threats from already-authenticated low-privileged members. Deploying a strict Content Security Policy (CSP) header (e.g., script-src 'self') can reduce the impact of injected payloads by blocking external script execution, though this may interfere with Plane's rich-text editor functionality and should be tested in a staging environment first. Additionally, auditing existing intake items for unexpected HTML or script tags in the description_html field can help identify whether exploitation has already occurred.
Plane version 0.7.1 allows an unauthenticated attacker to view all stored server files of all users. Rated high severity
Plane is an open-source project management tool. Rated medium severity (CVSS 5.8), this vulnerability is remotely exploi
Plane version 0.7.1-dev allows an attacker to change the avatar of his profile, which allows uploading files with HTML e
Plane is an an open-source project management tool. [CVSS 8.5 HIGH]
Cross-workspace authorization bypass in Plane (makeplane) prior to version 1.3.1 allows any authenticated user of one wo
Plane versions before 1.2.2 contain a server-side request forgery vulnerability in the "Add Link" feature that allows au
Server-Side Request Forgery (SSRF) in Makeplane Plane (versions 0.28.0 to before 1.3.0) allows authenticated attackers w
Plane project management tool versions prior to 1.3.0 allow authenticated project members to modify issue dates across w
Unauthenticated attackers can enumerate workspace members and harvest sensitive information including email addresses, u
Cross-tenant authorization bypass in Plane's asset-management API allows any authenticated workspace member to read, del
ORM Field Reference Injection in Plane versions 1.3.0 and below enables any authenticated workspace MEMBER to exfiltrate
Plane prior to version 1.2.2 allows authenticated users to modify project assets across any workspace by directly refere
Same weakness CWE-79 – Cross-site Scripting (XSS)
View allShare
External POC / Exploit Code
Leaving vuln.today