CVE
ideon: Read-only project viewers can wipe and rewrite the canvas and tamper with blocks/files via role-unchecked project endpoints
Affects ideon versions before 0.9.4 in projects where a collaborator holds the read-only viewer role. Fixed in 0.9.4.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 0.9.4
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 0.9.4.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 26/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
ideon is a self-hosted visual workspace. Prior to version 0.9.4, several project mutation endpoints under /api/projects/[id]/* resolve the caller's project role but never enforce it, so a user who was granted only the read-only viewer role on a project can perform write operations on that project. The most severe is POST /api/projects/[id]/graph, which deletes every block and link in the project and re-inserts client-supplied ones. A viewer can silently rewrite or wipe the entire canvas of a project they were invited to read. The application clearly intends viewer to be read-only: the collaborators endpoint, the automation endpoints, and the realtime Yjs sync path all reject write attempts from viewers. These specific HTTP handlers simply omit the guard their siblings enforce. This issue has been patched in version 0.9.4.
Who should check
Teams running ideon 0.9.3 or earlier that share projects with viewer-role collaborators
Not fixed by: Client-side blocking of viewer block dragging does not stop these HTTP endpoints.
Read the source excerpt
“a user who was granted only the read-only viewer role on a project can perform write operations on that project”
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed, reachable over the network without a login · Unknown: Advisories don't say whether default setups are affected
- Reach?/20Unknown. No tracked technology or package matched
- Severity8.7/10CVSS 8.7
- No patch0/5No signal
What would change the score
- Would score about 71 if added to CISA KEV
- Would score about 66 if CISA's SSVC rates exploitation active
- Would score about 31 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 0.9.4.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-65965 (ideon: Read-only project viewers can wipe and rewrite the canvas and tamper with blocks/files via role-unchecked project endpoints), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-65965 (entry last updated 2026-11-11):
Affected:
- 3xpyth0n ideon: fixed in 0.9.4
Fixed versions: 0.9.4.
Conditions (all must be true for the bug to be hit):
- Attacker must be a collaborator granted the read-only viewer role on the project. (source: https://github.com/3xpyth0n/ideon/security/advisories/GHSA-v3qr-4v8m-29rh)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, no login, no user action.
CISA KEV: CVE-2026-65965 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-65965 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/3xpyth0n/ideon/security/advisories/GHSA-v3qr-4v8m-29rh
- https://github.com/3xpyth0n/ideon/commit/ed58ca7a70543c7fc4ebfef59a2ca34e480e44d1
- https://github.com/3xpyth0n/ideon/releases/tag/v0.9.4
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-65965
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-65965"}.Timeline
- CVE published
- First seen by cve.now
Affected versions
- 3xpyth0n ideon
fixed in 0.9.4
Evidence 5
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Advisory
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Other links · 2
- Repository
- Repository
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-65965
Is CVE-2026-65965 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A user granted only the read-only viewer role on a project can perform write operations on it. They can delete every block and link, replace the canvas with attacker-controlled content, change block metadata, and upload or delete project files.Source: github.com
Which versions are affected by CVE-2026-65965?
ideon: before 0.9.4.Source: cve.now feed data
Am I affected, and how do I check?
ideon versions before 0.9.4 are affected, in projects where a collaborator has been granted the read-only viewer role. To check, look at the ideon version in use and the role each collaborator holds on the project.Source: github.com
How do I fix CVE-2026-65965?
Upgrade ideon to 0.9.4 or later, which is the fixed version listed for this vulnerability.Source: github.com