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High

pgAdmin 4 has deserialization of untrusted data in its FileBackedSessionManager

  • Disclosed: 11.05.2026
  • Updated: 11.10.2026 15:17

Deserialization of untrusted data (CWE-502) in pgAdmin 4 FileBackedSessionManager.

The session manager performed unsafe deserialization of session-file contents (using Python's standard object-serialization module) before performing any HMAC integrity check. Any file dropped into the sessions directory was deserialized unconditionally. An authenticated user with write access to the sessions directory (whether by misconfiguration or in combination with another path-traversal flaw) could plant a crafted serialized payload to achieve operating-system level remote code execution under the pgAdmin process identity.

Fix prepends a 64-byte hex SHA-256 HMAC over the session body, computed with SECRET_KEY, and verifies it via hmac.compare_digest before any deserialization. The check is raised (rather than asserted) on empty SECRET_KEY so it is not stripped under -O.

This issue affects pgAdmin 4: before 9.15.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) pgadmin4 < 9.15 9.15

References

CVSS score 7/10
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-502
Platform
Python (PyPI)
Package
pgadmin4
Disclosed
11.05.2026
Updated
11.10.2026 15:17

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-2865 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-4rhg-h8f2-v4jm - CC BY 4.0

Vulnerability history: pgadmin4

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (28) in the archive
Total entries
28
First → latest
03.2022 05.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 6
  • High 14
  • Medium 8

Disclosures per year

Severity:
  1. pgAdmin 4 contains local file inclusion (LFI) and server-side request forgery (SSRF) vulnerabilities
    High · 6.5 CVE-2026-7817 < 9.15 9.15
  2. SQL injection vulnerability in pgAdmin 4 Maintenance Tool
    High · 8.8 CVE-2026-7815 < 9.15 9.15
  3. pgAdmin 4: OS command injection vulnerability in Import/Export query export
    High · 8.8 CVE-2026-7816 < 9.15 9.15
  4. pgAdmin 4 File Manager has symbolic-link path traversal
    High · 8.1 CVE-2026-7819 < 9.15 9.15
  5. pgAdmin 4 has deserialization of untrusted data in its FileBackedSessionManager this entry
    High · 7.0 CVE-2026-7818 < 9.15 9.15
  6. pgAdmin 4 server mode has an authorization vulnerability affecting Server Groups, Servers, Shared Servers, Background Processes, and Debugger modules
    Critical · 9.9 CVE-2026-7813 < 9.15 9.15
  7. pgadmin4 affected by a Restore restriction bypass via key disclosure vulnerability
    High · 7.4 CVE-2026-1707 < 9.12 9.12
  8. pgadmin4 has a Meta-Command Filter Command Execution
    Critical · 9.1 CVE-2025-13780 < 9.11 9.11
  9. pgAdmin has vulnerability in LDAP authentication mechanism that allows bypassing TLS certificate verification
    High · 7.5 CVE-2025-12765 < 9.10 9.10
  10. pgAdmin is affected by an LDAP injection vulnerability
    High · 7.5 CVE-2025-12764 < 9.10 9.10
  11. pgAdmin4 vulnerable to Remote Code Execution (RCE) when running in server mode
    Critical · 9.1 CVE-2025-12762 < 9.10 9.10
  12. pgadmin4 is affected by a Cross-Origin Opener Policy (COOP) vulnerability
    High · 7.9 CVE-2025-9636 < 9.8 9.8
  13. pgAdmin 4 Vulnerable to Remote Code Execution
    Critical · 9.9 CVE-2025-2945 < 9.2 9.2
  14. pgAdmin 4 Vulnerable to Cross-Site Scripting (XSS) via Query Result Rendering
    Critical · 9.1 CVE-2025-2946 < 9.2 9.2
  15. pgAdmin has Incorrect Default Permissions
    High · 8.0 CVE-2023-1907 < 7.0 7.0
  16. OAuth2 client ID and secret exposed through the web browser
    High · 8.6 CVE-2024-9014 < 8.12 8.12
  17. pgAdmin Cross-site Scripting vulnerability in /settings/store API response json payload
    High · 7.4 CVE-2024-4216 < 8.6 8.6
  18. pgAdmin Remote Code Execution (RCE) vulnerability
    High · 7.4 CVE-2024-3116 < 8.5 8.5
  19. pgAdmin 4 vulnerable to Unsafe Deserialization and Remote Code Execution by an Authenticated user
    Critical · 9.9 CVE-2024-2044 < 8.4 8.4
  20. pgadmin4 vulnerable to Code Injection
    High · 8.8 CVE-2022-4223 < 6.17 6.17

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