# CVE-2026-77105: Commvault CommServe cryptographic signature verification in privilege management

Source: https://junglewise.ai/threats/cve-2026-77105-commvault-commserve-cryptographic-signature-verification-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-77105 · Severity: high · CVSS 8.8 · Published 2026-09-08

Commvault CommServe, a backup and disaster recovery management platform, contains a flaw in how it verifies cryptographic signatures used to control administrative access. An attacker who can interact with CommServe or its web server could exploit this to escalate privileges and gain unauthorized administrative control over the system, potentially compromising all protected data and operations.

Technologies: [Commvault CommServe](https://junglewise.ai/threats/technologies/commserve). Vendors: [Commvault](https://junglewise.ai/threats/vendors/commvault).

## Quick answers

**Is CVE-2026-77105 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77105 being exploited in the wild.

**How severe is CVE-2026-77105?** High severity, with a CVSS score of 8.8, published 8 September 2026.

**Which products and versions are affected?** Commvault CommServe 11.36.0-11.36.122, 11.40.0-11.40.71, 11.44.0-11.44.19, 11.46.0-11.46.19; Commvault Web Server 11.36.0-11.36.122, 11.40.0-11.40.71, 11.44.0-11.44.19, 11.46.0-11.46.19.

**Is there a fix for CVE-2026-77105?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-77105 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-77105?** Check whether you run Commvault CommServe or Commvault Web Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a cryptographic signature verification issue in the CommServe privilege management subsystem. The flaw allows bypass or manipulation of signature verification checks that are intended to authenticate and authorize privileged operations. An attacker with network access to CommServe or its web server can exploit this to escalate privileges without requiring valid credentials. The attack vector appears to be network-based and does not require prior authentication. Commvault has released patched maintenance releases for affected versions (11.36.x, 11.40.x, 11.44.x, and 11.46.x tracks), and customers are advised to upgrade immediately.

## Affected products

- Commvault CommServe 11.36.0-11.36.122, 11.40.0-11.40.71, 11.44.0-11.44.19, 11.46.0-11.46.19
- Commvault Web Server 11.36.0-11.36.122, 11.40.0-11.40.71, 11.44.0-11.44.19, 11.46.0-11.46.19

## Timeline

- 2026-09-08: disclosed

## References

- [https://documentation.commvault.com/securityadvisories/CV_2026_08_7.html](https://documentation.commvault.com/securityadvisories/CV_2026_08_7.html)

## Related threats

- [Commvault CommServe path traversal information disclosure](https://junglewise.ai/threats/cve-2026-77104-commvault-commserve-path-traversal-information-disclosure)
- [Commvault CommServe authentication bypass](https://junglewise.ai/threats/cve-2026-77103-commvault-commserve-authentication-bypass)
- [Commvault CommServe heap buffer overflow](https://junglewise.ai/threats/cve-2026-77102-commvault-commserve-heap-buffer-overflow)
- [Commvault CommServe stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-77101-commvault-commserve-stack-based-buffer-overflow)
- [Commvault CommServe authorization bypass in command execution](https://junglewise.ai/threats/cve-2026-13738-commvault-commserve-authorization-bypass-in-command-execution)