Affects Commvault CVFS, an enterprise backup component used broadly; info disclosure in backup infrastructure can expose sensitive corporate data across organizations.
CVE-2026-77090
Commvault CVFS XXE allows sensitive data disclosure (CVSS 8.7).
Is CVE-2026-77090 being exploited?
Not confirmed. CVE-2026-77090 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 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-77090?
CVE-2026-77090 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-2026-77090?
Yes. A fix has been recorded for CVE-2026-77090. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77090 affect?
CVE-2026-77090 affects Commvault CVFS, Commvault products using CVFS component. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77090?
Apply the vendor CVFS maintenance update immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
XML External Entity (XXE) flaw allows attackers to read sensitive files or access internal resources, causing data disclosure.
Immediate action required
- affected>= 11.46.0 and <= 11.46.29
- affected>= 11.44.0 and <= 11.44.24
- affected>= 11.40.0 and <= 11.40.77
- affected>= 11.36.0 and <= 11.36.126
- affected>= 5.0.1.0 and <= 5.0.14.4
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.