Unrated

Unauthenticated access in PraisonAI A2U server

IdentifiersCVE-2026-57146CWE-306

CVE-2026-57146 is an authentication flaw in PraisonAI A2U affecting deployments started with the documented praisonai serve a2u command. An incomplete prior fix leaves A2U subscription and event-related routes unauthenticated by default unless the A2U_AUTH_TOKEN environment variable is explicitly configured. As a result, a reachable A2U server may permit unauthenticated access to A2U information and event-stream functionality. The issue stems from missing authentication enforcement on exposed A2U routes rather than a credential bypass after successful login.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

A remote attacker with network access to an affected A2U instance can interact with unauthenticated A2U endpoints and obtain information that should require authorization. Exposed data may include agent responses, tool-call output, thinking or progress events, stream metadata, and access to subscription-based event streams. This can result in unauthorized disclosure of potentially sensitive operational or application data and monitoring of agent activity.

Mitigation

If you can’t patch tonight, do this now.

Until the fixed version is deployed, do not expose the A2U service to untrusted networks. Restrict access to localhost or a trusted management network, avoid binding the service to all interfaces unless strictly necessary, and explicitly set A2U_AUTH_TOKEN before startup so authentication is required on A2U routes. Additional network-layer access controls such as reverse-proxy authentication, firewall restrictions, or VPN-only exposure can further reduce risk.

Remediation

Patch, then assume compromise.

Upgrade praisonai to version 4.6.61 or later. After upgrading, verify that A2U authentication is enforced by default and confirm that unauthenticated requests to A2U subscription and related routes are rejected with an authorization error. Review deployment configuration to ensure authentication settings are consistently applied across all A2U startup methods.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

MervinPraisonPraisonaiapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

No public activity tracked yet. Mallory keeps watching.

0 SOURCESView more in app

No public activity observed for this vulnerability.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity