Affects Commvault CommServe, a widely deployed enterprise backup platform; privilege escalation could compromise backups and corporate infrastructure.
CVE-2026-77105
Commvault CommServe signature verification flaw enables privilege escalation
Is CVE-2026-77105 being exploited?
Not confirmed. CVE-2026-77105 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.18% probability of exploitation in the next 30 days.
How severe is CVE-2026-77105?
CVE-2026-77105 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-77105?
Yes. A fix has been recorded for CVE-2026-77105. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77105 affect?
CVE-2026-77105 affects Commvault CommServe, CommServe Web Server, Commvault backup deployments. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77105?
Apply vendor maintenance release to CommServe and web server immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Signature verification bypass allows attackers to elevate privileges on CommServe/Web Server, access or tamper with backups and pivot inside networks.
Immediate action required
- affected>= 11.46.0 and <= 11.46.19
- affected>= 11.44.0 and <= 11.44.19
- affected>= 11.40.0 and <= 11.40.71
- affected>= 11.36.0 and <= 11.36.122
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.