What’s Vulnerable › Vulnerabilities
CVE-2026-7818: pgAdmin 4: Unsafe deserialization (CWE-502) in file-backed session manager leads to remote code execution
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-11 · updated 2026-10-26
- Weakness: CWE-502
Description
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 products
- pgadmin.org pgAdmin 4: before 9.15 — fixed in 9.15
How to fix
Upgrade to a fixed version: pgadmin.org pgAdmin 4 9.15. Check the vendor advisory for mitigations.
References
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