CVE-2020-15270 Improper session expiration in Parse Server

What is CVE-2020-15270?

CVE-2020-15270 is a medium-severity authentication bypass vulnerability in Parseplatform Parse-Server, published on 22 Oct 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Parse Server (npm package parse-server) broadcasts events to all clients without checking if the session token is valid. This allows clients with expired sessions to still receive subscription objects. It is not possible to create subscription objects with invalid session tokens. The issue is not patched.

Weakness: CWE-672

Which versions are affected by CVE-2020-15270?

3 open source packages ship an affected version, including parse-server and parse. It affects 1 product.

Products include Parseplatform Parse-Server.

How do I fix CVE-2020-15270?

Upgrade parse-server to 4.4.0 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-15270 being exploited?

There is no known exploitation of CVE-2020-15270 in the wild and no public exploit code.

Other vulnerabilities in Parseplatform Parse-Server

• CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write Critical 10.0
• CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection Critical 10.0
• CVE-2022-24760 Command Injection in Parse server Critical 10.0
• CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter Critical 9.9
• CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution Critical 9.8

All Parseplatform Parse-Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-parse-2020-15270, GHSA-2xm2-xj2q-qgpj.