Comfyui-manager: Unprotected Alternate Channel
CVE-2025-67303 is a high-severity unprotected alternate channel vulnerability in Comfyui-manager from Comfy, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 3.38 as the first without the flaw, so updating Comfyui-manager to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.39% chance of exploitation within 30 days, higher than 73% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Comfyui-manager to 3.38 or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Comfy | Comfyui-manager | before 3.38 | 3.38 |
Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. Scored by CISA (ADP).
Official description
An issue in ComfyUI-Manager prior to version 3.38 allowed remote attackers to potentially manipulate its configuration and critical data. This was due to the application storing its files in an insufficiently protected location that was accessible via the web interface
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unprotected Alternate Channel
The product protects a primary channel, but it does not use the same level of protection for an alternate channel.
How developers prevent this class of flaw
- Identify all alternate channels and use the same protection mechanisms that are used for the primary channels.
More Unprotected Alternate Channel vulnerabilities (CWE-420)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Technical write-ups (may include proof of concept)
- github.com/Comfy-Org/ComfyUI-Manager/blob/main/docs/en/v3.38-userdata-security-migration.mdExploit, Third Party Advisory
Recent Unprotected Alternate Channel vulnerabilities
- 8.8 High severity
- 9.8 Critical severity
- 8.0 High severity
- 8.8 High severity
- 7.4 High severity
- 9.8 Critical severity
CrushFTP Unprotected Alternate Channel Exploited
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