Vulnerability · Published Sep 4, 2026 · Assigned by GitHub_M
CVE-2026-53769Avo: Direct attachment upload endpoint lacks upload authorization and bypasses field-level upload policy
Medium 6.5
In plain English
A medium-severity missing authorization in avo from avo-hq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Avo is a framework to create admin panels for Ruby on Rails apps. From version 2.28.0 to before version 3.32.0, Avo's direct attachment upload endpoint lacks server-side upload authorization and bypasses the documented field-level upload policy methods such as upload_{FIELD_ID}?. An authenticated Avo user who can reach the Avo attachment upload endpoint can replace or add attachment content, including binary content, filename, and content-type metadata, on a resolved record even when both update? and upload_<field>? policies deny the operation. This primarily affects multi-role Avo Pro/Advanced-style deployments where non-administrator or restricted operator users can reach Avo and per-record or per-field operations are expected to be enforced by policies. This issue has been patched in version 3.32.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| RubyGems | avo | 3.32.0 | GHSA-pqpw-cvm4-8mv9 |
Affected products (as reported)
Weakness: CWE-862, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
References
- https://github.com/avo-hq/avo/security/advisories/GHSA-pqpw-cvm4-8mv9 x_refsource_CONFIRM
- https://github.com/avo-hq/avo/pull/4520 x_refsource_MISC
- https://github.com/avo-hq/avo/commit/de12070dbac0cb6a7e2bea357f9697f99e92554c x_refsource_MISC
- https://github.com/avo-hq/avo/releases/tag/v3.32.0 x_refsource_MISC