CVE-2026-34953: Praisonai Authentication Bypass Vulnerability

CRITICAL
Advisory Identifier: GHSA-98f9-fqg5-hvq5
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CVSS 9.1
CWE-863
Published
Advisory Summary

CVE-2026-34953 is a CRITICAL (CVSS 9.1) authentication bypass vulnerability (CWE-863: Incorrect Authorization) affecting Praisonai libraries in the PyPI ecosystem. The issue involves praisonai has authentication bypass via oauthmanager.validate_token(). Remediation is available by upgrading affected packages to version 4.5.97.

CVE-2026-34953 at a Glance

CVE Identifier CVE-2026-34953
GHSA Identifier GHSA-98f9-fqg5-hvq5
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-863: Incorrect Authorization
Affected Product Praisonai
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-34953

To remediate this vulnerability, upgrade all affected Praisonai dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

praisonai fixed: 4.5.97 
pip install praisonai>=4.5.97
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show praisonai

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-34953, inspect your installed packages using pip:

pip show praisonai

Analyze the terminal output to locate any version of Praisonai in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.5.97), your application is affected.

Note: The pip show praisonai command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Praisonai, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary `OAuthManager.validate_token()` returns `True` for any token not found in its internal store, which is empty by default. Any HTTP request to the MCP server with an arbitrary Bearer token is treated as authenticated, granting full access to all registered tools and agent capabilities. ### Details `oauth.py:364` (source) -> `oauth.py:374` (loop miss) -> `oauth.py:381` (sink) ```python # source def validate_token(self, token: str) -> bool: for stored_token in self._tokens.values(): if stored_token.access_token == token: return not stored_token.is_expired() # sink -- _tokens is empty by default, loop never executes, falls through return True ``` ### PoC ```bash # install: pip install -e src/praisonai # start server: praisonai mcp serve --transport http-stream --port 8080 curl -s -X POST http://127.0.0.1:8080/mcp \ -H "Authorization: Bearer fake_token_abc123" \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","method":"tools/list","id":1}' # expected output: 200 OK with full tool list (50+ tools) # including praisonai.agent.run, praisonai.workflow.run, praisonai.containers.file_write ``` ### Impact Any unauthenticated attacker with network access to the MCP HTTP server can call all registered tools including agent execution, workflow runs, container file read/write, and skill loading. The server binds to `0.0.0.0` by default with no API key required. ### Suggested Fix ```python def validate_token(self, token: str) -> bool: for stored_token in self._tokens.values(): if stored_token.access_token == token: return not stored_token.is_expired() # Unknown tokens must be rejected. # For external/JWT tokens, call the introspection endpoint here before returning. return False ```

CVE-2026-34953 Affected Praisonai Versions

1 component(s)
Fixed Versions:
4.5.97
Product / Package Ecosystem Affected Versions Fixed Version
praisonai
pypi/praisonai
PyPI
< 4.5.97
4.5.97

References

GitHub Advisory / Wiki ADVISORY
https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-98f9-fqg5-hvq5
NVD — CVE-2026-34953 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34953
Praisonai Source Repository REPOSITORY
https://github.com/MervinPraison/PraisonAI

Frequently Asked Questions

What is CVE-2026-34953?
CVE-2026-34953 is a security vulnerability in Praisonai involving PraisonAI Has Authentication Bypass via OAuthManager.validate_token() under CWE-863: Incorrect Authorization.
Which Praisonai versions are affected?
Affected versions include releases prior to 4.5.97 across affected packages: praisonai.
What version fixes CVE-2026-34953?
Upgrading to 4.5.97 (or the latest patched release for your respective branch) resolves the vulnerability.
Is praisonai affected?
Yes, praisonai is affected in releases prior to 4.5.97. Upgrade your dependency to 4.5.97 or later.
What is the CVSS score of CVE-2026-34953?
CVE-2026-34953 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-34953?
CVE-2026-34953 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check PyPI dependencies for CVE-2026-34953?
Run the dependency tree command: 'pip show praisonai'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-98f9-fqg5-hvq5",
  "modified" : "2026-04-06T22:54:25Z",
  "published" : "2026-04-01T23:29:01Z",
  "aliases" : [ "CVE-2026-34953" ],
  "summary" : "PraisonAI Has Authentication Bypass via OAuthManager.validate_token()",
  "details" : "### Summary\n\n`OAuthManager.validate_token()` returns `True` for any token not found in its internal store, which is empty by default. Any HTTP request to the MCP server with an arbitrary Bearer token is treated as authenticated, granting full access to all registered tools and agent capabilities.\n\n### Details\n\n`oauth.py:364` (source) -> `oauth.py:374` (loop miss) -> `oauth.py:381` (sink)\n```python\n# source\ndef validate_token(self, token: str) -> bool:\n    for stored_token in self._tokens.values():\n        if stored_token.access_token == token:\n            return not stored_token.is_expired()\n\n# sink -- _tokens is empty by default, loop never executes, falls through\n    return True\n```\n\n### PoC\n```bash\n# install: pip install -e src/praisonai\n# start server: praisonai mcp serve --transport http-stream --port 8080\n\ncurl -s -X POST http://127.0.0.1:8080/mcp \\\n  -H \"Authorization: Bearer fake_token_abc123\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"jsonrpc\":\"2.0\",\"method\":\"tools/list\",\"id\":1}'\n\n# expected output: 200 OK with full tool list (50+ tools)\n# including praisonai.agent.run, praisonai.workflow.run, praisonai.containers.file_write\n```\n\n### Impact\n\nAny unauthenticated attacker with network access to the MCP HTTP server can call all registered tools including agent execution, workflow runs, container file read/write, and skill loading. The server binds to `0.0.0.0` by default with no API key required.\n\n### Suggested Fix\n```python\ndef validate_token(self, token: str) -> bool:\n    for stored_token in self._tokens.values():\n        if stored_token.access_token == token:\n            return not stored_token.is_expired()\n    # Unknown tokens must be rejected.\n    # For external/JWT tokens, call the introspection endpoint here before returning.\n    return False\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "praisonai"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.5.97"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.5.96"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-98f9-fqg5-hvq5"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34953"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/MervinPraison/PraisonAI"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-01T23:29:01Z",
    "nvd_published_at" : "2026-04-03T23:17:06Z"
  }
}