CVE-2026-48508
Auth bypass in Lemur allows read-only users to create root CAs and upload certificates.
Is CVE-2026-48508 being exploited?
Not confirmed. CVE-2026-48508 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 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-48508?
CVE-2026-48508 is rated High with a CVSS score of 8.8. 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-2026-48508?
Yes. A fix has been recorded for CVE-2026-48508. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-48508 affect?
CVE-2026-48508 affects Lemur < 1.9.1, Lemur 1.9.0 and earlier, lemur/auth/permissions.py. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-48508?
Upgrade to Lemur 1.9.1 immediately; restrict API/UI access and enforce strict auth flags as temporary mitigations.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated read-only users can create root CAs, upload arbitrary certs, create domains, and craft notifications (SSRF), enabling CA compromise and possible RCE.
Immediate action required
- affected< 1.9.1
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.