TI-2026-38773 Aliases CVE-2026-53769 GHSA-pqpw-cvm4-8mv9

Avo: Direct attachment upload endpoint lacks upload authorization and bypasses field-level upload policy

MEDIUM 62CWE-862Published 2026-09-04 · Updated 2026-09-09

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · None
Fix status: Partial Red Hat: 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-862.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00423 36th percentileScored 2026-11-07

Fix Partial avo (avo-hq): 3.32.0avo (RubyGems): 3.32.0Red Hat: 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
avo-hq	avo	2.28.0 to before 3.32.0	3.32.0	Patch available	CNA
—	avo (RubyGems)	2.28.0 to before 3.32.0	3.32.0	Patch available	GHSA-pqpw-cvm4-8mv9

avo Vendoravo-hq Affected 2.28.0 to before 3.32.0 Fixed in 3.32.0 Patch available CNA
avo (RubyGems) Vendor— Affected 2.28.0 to before 3.32.0 Fixed in 3.32.0 Patch available GHSA-pqpw-cvm4-8mv9

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:avohq:avo::::::::	—	—	avo-hq

cpe:2.3:a:avohq:avo:*:*:*:*:*:*:*:* Versions — — ·avo-hq

Remediation

Fix · CNA avo (avo-hq) Fixed in 3.32.0
Fix · GHSA-pqpw-cvm4-8mv9 avo (RubyGems) Fixed in 3.32.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat OpenShift GitOps	Affected	No fix yet: Fix deferred
Red Hat OpenStack Platform 18.0	Affected	No fix yet: Fix deferred

Not affected: 1 product

Red Hat Hardened Images

Timeline

2026-10-02 Threatist record created from CVE-2026-53769
2026-10-03 Alias added: GHSA-pqpw-cvm4-8mv9

References

Other 5

TI-2026-40064 Authorization bypass in avo-hq avo CVSS 3.1CRITICAL 9.6
TI-2026-30526 Avo: Broken Access Control: Unauthorized Execution of Arbitrary Action Classes Across Resources CVSS 3.1HIGH 8.8
TI-2023-16948 Possible unsafe reflection / partial denial of service in avo CVSS 3.1HIGH 8.8
TI-2023-16949 Stored XSS (Cross Site Scripting) in html content based fields of avo CVSS 3.1HIGH 7.3
TI-2024-14784 Stored cross-site scripting (XSS) in `key_value` field in Avo CVSS 3.1HIGH 7.3
TI-2024-14985 Cross site scripting in Action messages on Avo CVSS 3.1MEDIUM 6.5

See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences