CVE-2026-11403
Nexus API key flaw allows user impersonation and unauthorized repository operations
Is CVE-2026-11403 being exploited?
Not confirmed. CVE-2026-11403 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 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-11403?
CVE-2026-11403 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-2026-11403?
Yes. A fix has been recorded for CVE-2026-11403. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-11403 affect?
CVE-2026-11403 affects Sonatype Nexus Repository Manager, NuGet API Key realm, Docker Bearer Token realm, npm Bearer Token realm. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-11403?
Apply vendor patch when available; if not, disable format-specific API key realms and rotate API keys.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can impersonate a user to perform repo operations (read/write/delete, publish), enabling code theft or supply-chain poisoning.
Immediate action required
- affected>= 3.0.0 and < 3.93.0
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.