EUVD-2026-42894
GHSA-5c3v-h6hw-4gx7
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible with no authentication required; integrity impact limited to model instruction manipulation with no confidentiality or availability impact to the vulnerable system.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
PraisonAI before 4.6.78 contains a prompt injection defense bypass vulnerability where the injection defense only blocks threats classified as CRITICAL, requiring three or more detector families to match simultaneously. Attackers can craft single or double-vector prompt injections that are classified as HIGH threat level and pass through unblocked to reach the model.
AnalysisAI
Prompt injection defenses in PraisonAI before version 4.6.78 can be bypassed by crafting single or double-vector injections classified at the HIGH threat level, which the protection mechanism silently allows through to the underlying language model. The defense only blocks CRITICAL-classified injections - those matching three or more detector families simultaneously - meaning attackers who deliberately keep their payload below that threshold face no blocking at all. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target deployment runs PraisonAI in a version prior to 4.6.78 with its built-in prompt injection defense active and that user-controlled input reaches the detector pipeline. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N) reflects network-reachable, unauthenticated exploitation with low attack complexity and limited integrity impact to the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker submits a crafted user message to an externally accessible PraisonAI-powered application, deliberately constructing the payload to trigger exactly one or two detector families - for example, combining a role-override instruction with a subtle data-extraction directive that avoids a third detection signal. The defense classifier rates the input HIGH rather than CRITICAL and passes it through unblocked; the model receives and executes the injected instructions, potentially leaking system prompt contents or performing unintended tool calls. … |
| Remediation | Upgrade PraisonAI to version 4.6.78 or later, as confirmed by the vendor security advisory at https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-4r3p-w3mc-5v34. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Remote code execution in PraisonAI before 1.6.78 allows attackers to run arbitrary Python on the host by manipulating th
Root-level command execution and arbitrary file write in PraisonAI's AICoder component (all versions before 4.6.78) let
Path traversal in PraisonAI multi-agent teams system (versions prior to 4.5.128) enables arbitrary file overwrite throug
Remote code execution in PraisonAI before 4.6.78 lets an attacker who can supply the agents_file parameter to deploy/api
SQL/CQL injection in PraisonAI's PGVector and Cassandra knowledge-store backends before 4.6.78 allows a caller who contr
PraisonAI AgentOS prior to version 4.5.128 exposes agent metadata including names, roles, and system instruction snippet
Remote code execution in PraisonAI multi-agent framework (versions prior to 4.5.128) allows unauthenticated attackers to
Unauthenticated remote session hijacking in PraisonAI's browser bridge (versions <4.5.139) and praisonaiagents (<1.5.140
Unauthenticated agent access in PraisonAI before 1.7.3 lets remote attackers read agent instructions and system prompts
Webhook signature-verification bypass in PraisonAI before 4.6.78 lets unauthenticated attackers forge Svix 'message.rece
Authentication bypass in PraisonAI before 4.6.78 lets a remote, unauthenticated attacker reach the Call API agent-invoca
System prompt extraction and unauthorized tool invocation in PraisonAI before 4.6.78 arise because the prompt-injection
Same weakness CWE-693 – Protection Mechanism Failure
View allSame technique Authentication Bypass
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External POC / Exploit Code
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