CVE-2026-66057

MEDIUM 5.1

Published 2026-10-13 · Last modified 2026-10-14

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.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.4%chance of exploitation in 30 days · 35th percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

5.1CVSS 4.0 · MEDIUM

ConfidentialityLow
IntegrityNone
AvailabilityNone

What an attacker needs

✓Access: Reachable over the network — no local access needed
✓Privileges: No account or privileges required
⚠User interaction: Requires active user interaction
✓Complexity: No special conditions — reliably repeatable
✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

github-search Search GitHub for public PoC repos

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-66057/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-66057/poc.json

Affected

Vendors Frappe

Products Frappe

Weakness (CWE)

CWE-601: : URL Redirection to Untrusted Site ('Open Redirect')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

All CVSS metrics

MEDIUM 5.1 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
MEDIUM 5.1 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

References

Technical & other

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

Sources: NVD · CVE.org · EPSS