Commvault Cloud: Authentication Bypass Using an Alternate Path or Channel
CVE-2026-77103 is a high-severity authentication bypass using an alternate path or channel vulnerability in Commvault Cloud from Commvault, 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. Affected Commvault Cloud versions: 11.46.0 through 11.46.19; 11.44.0 through 11.44.19; 11.40.0 through 11.40.71, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.5% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Commvault to 11.36.123 or 11.40.72 or 11.44.20 or 11.46.20, whichever matches your release line, or a later version.
- Read the advisory on documentation.commvault.com for workarounds and exact fixed builds.
- 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 |
|---|---|---|---|
| Commvault | Commvault Cloud | 11.46.0 through 11.46.19; 11.44.0 through 11.44.19; 11.40.0 through 11.40.71; 11.36.0 through 11.36.122 | Not stated |
| Commvault | Commvault | 11.36.0 up to, but not including, 11.36.123; 11.40.0 up to, but not including, 11.40.72; 11.44.0 up to, but not including, 11.44.20; 11.46.0 up to, but not including, 11.46.20 | 11.36.123, 11.40.72, 11.44.20, 11.46.20 |
Version data comes from the organisation that assigned the CVE. 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
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.7 | High | CNA |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
CommServe contained an authentication bypass issue affecting access authorization and information disclosure. Software customers upgrade to resolved maintenance release. Update CommServe.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Authentication Bypass Using an Alternate Path or Channel
The product requires authentication, but the product has an alternate path or channel that does not require authentication.
How developers prevent this class of flaw
- Funnel all access through a single choke point to simplify how users can access a resource. For every access, perform a check to determine if the user has permissions to access the resource.
More Authentication Bypass Using an Alternate Path or Channel vulnerabilities (CWE-288)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Commvault Cloud
- 8.7 High severity
- 7.1 High severity
- 8.7 High severity
- 7.7 High severity
- 7.1 High severity
- 7.1 High severity
Recent Authentication Bypass Using an Alternate Path or Channel vulnerabilities
- 7.8 High severity
- 8.1 High severity
- 8.8 High severity
- 7.5 High severity
- 8.1 High severity
- 9.8 Critical severity
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