CVE-2026-49998
JWT verification bug in Centrifugo allows cross-issuer token acceptance and impersonation.
Is CVE-2026-49998 being exploited?
Not confirmed. CVE-2026-49998 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 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-49998?
CVE-2026-49998 is rated High with a CVSS score of 8.2. 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-2026-49998?
Yes. A fix has been recorded for CVE-2026-49998. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49998 affect?
CVE-2026-49998 affects Centrifugo < 6.8.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49998?
Upgrade Centrifugo to 6.8.1 immediately; restrict dynamic JWKS and rotate keys if patch delayed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
JWKS cache/key lookup flaw lets attacker present a JWT from one issuer and be verified as another, enabling auth bypass, impersonation, and privilege escalation.
Immediate action required
- affected< 6.8.1
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.