CVE-2026-66057: Frappe: Open Redirect via Unsanitized OAuth State Param.

Severity: medium (CVSS 5.1 v4.0)
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: 2026-10-13 · updated 2026-10-14
Weakness: CWE-601

Description

Frappe is a full-stack web application framework. Prior to 15.116.0 and 16.29.0, the OAuth login flow uses an unsanitized client-controlled state parameter to select post-authentication navigation, allowing a crafted state value to redirect a user to an attacker-chosen location. This issue is fixed in versions 15.116.0 and 16.29.0.

Affected products

frappe: before 15.116.0; from 16.0.0, < 16.29.0

References

https://github.com/frappe/frappe/commit/12568e2d54c4abba70bc0261387053fa28f90988
https://github.com/frappe/frappe/commit/1e0a3b941231d74a71ff1a43eee2e9f63c88712d
https://github.com/frappe/frappe/commit/6ed8acd869199feb3a2598887d471448297edf07
https://github.com/frappe/frappe/pull/40962
https://github.com/frappe/frappe/releases/tag/v15.116.0
https://github.com/frappe/frappe/releases/tag/v16.29.0
https://github.com/frappe/frappe/security/advisories/GHSA-78c5-55xg-jm7m

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