CVE-2026-31828: Parse Server has an LDAP injection via unsanitized user input in DN and group filter construction

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-10 · updated 2026-06-17
Weakness: CWE-90

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.13 and 8.6.26, the LDAP authentication adapter is vulnerable to LDAP injection. User-supplied input (authData.id) is interpolated directly into LDAP Distinguished Names (DN) and group search filters without escaping special characters. This allows an attacker with valid LDAP credentials to manipulate the bind DN structure and to bypass group membership checks. This enables privilege escalation from any authenticated LDAP user to a member of any restricted group. The vulnerability affects Parse Server deployments that use the LDAP authentication adapter with group-based access control. This vulnerability is fixed in 9.5.2-alpha.13 and 8.6.26.

Affected products

parse-community parse-server: before 8.6.26; from 9.0.0 before 9.5.2; 9.5.2-alpha1, 9.5.2-alpha10, 9.5.2-alpha11, 9.5.2-alpha12, 9.5.2-alpha2, 9.5.2-alpha3 (+6) — fixed in 8.6.26, 9.5.2

How to fix

Upgrade to a fixed version: parse-community parse-server 8.6.26, 9.5.2. Check the vendor advisory for mitigations.

References

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