CVE-2026-55518
Auth bypass: low-privileged Avo users can attach records via POST, enabling privilege escalation.
Is CVE-2026-55518 being exploited?
Not confirmed. CVE-2026-55518 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 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-55518?
CVE-2026-55518 is rated Critical with a CVSS score of 9.6. 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-2026-55518?
Yes. A fix has been recorded for CVE-2026-55518. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55518 affect?
CVE-2026-55518 affects Avo < 3.32.1, Avo < 4.0.0.beta.51, Ruby on Rails apps using Avo admin panels. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55518?
Upgrade to Avo >=3.32.1 or >=4.0.0.beta.51; restrict admin access and audit attachments.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated low-privileged user can bypass UI checks to attach relations via POST, enabling privilege escalation and cross-tenant data exposure.
Immediate action required
- affected>= 4.0.0.beta.1 and < 4.0.0.beta.51
- affected< 3.32.1
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.