CVE-2026-72859
Authorization bug in Budibase lets BASIC users generate S3 PutObject presigned URLs.
Is CVE-2026-72859 being exploited?
Not confirmed. CVE-2026-72859 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 0.18% probability of exploitation in the next 30 days.
How severe is CVE-2026-72859?
CVE-2026-72859 is rated High with a CVSS score of 8.3. 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-2026-72859?
Yes. A fix has been recorded for CVE-2026-72859. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72859 affect?
CVE-2026-72859 affects Budibase versions 3.39.4 before 3.40.0, AWS S3 buckets accessible by Budibase IAM credentials. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72859?
Upgrade to Budibase 3.40.0; restrict S3 write IAM perms and rotate affected keys.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attackers can obtain S3 PutObject presigned URLs to upload files to any S3 bucket accessible by Budibase IAM credentials, enabling unauthorized uploads and persistence.
Immediate action required
- affected>= 3.39.4 and < 3.40.0
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.