---
title: "CVE-2026-117656: Assent - Authentication Bypass"
description: "Assent 0.1.25 to < 0.3.2 contains an acceptance of extraneous untrusted data vulnerability in Sign in with Apple strategy caused by unverified user parameter merging over verified ID token claims, letting unauthenticated remote attackers impersonate users via the authorization callback user parameter."
url: https://panop.io/threat-heartbeat/CVE-2026-117656/
---

# CVE-2026-117656 Assent - Authentication Bypass

Assent 0.1.25 to < 0.3.2 contains an acceptance of extraneous untrusted data vulnerability in Sign in with Apple strategy caused by unverified user parameter merging over verified ID token claims, letting unauthenticated remote attackers impersonate users via the authorization callback user parameter.

CVSS base score 9.3 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.23% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-117656)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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

Published

31 October 2026

Updated

1 November 2026

Weakness

[CWE-290](https://cwe.mitre.org/data/definitions/290.html)

## Vendor fix

Upgrade to version 0.3.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-117656](https://nvd.nist.gov/vuln/detail/CVE-2026-117656)
- [https://cna.erlef.org/cves/CVE-2026-117656.html](https://cna.erlef.org/cves/CVE-2026-117656.html)
- [https://github.com/pow-auth/assent/commit/18898bde0296152165ae470078490e5798329b1b](https://github.com/pow-auth/assent/commit/18898bde0296152165ae470078490e5798329b1b)
- [https://github.com/pow-auth/assent/commit/a2d331e8c51376d6c0b04a81aad31e0b4d4d64a3](https://github.com/pow-auth/assent/commit/a2d331e8c51376d6c0b04a81aad31e0b4d4d64a3)
- [https://github.com/pow-auth/assent/security/advisories/GHSA-9fr5-g44g-9526](https://github.com/pow-auth/assent/security/advisories/GHSA-9fr5-g44g-9526)
- [https://osv.dev/vulnerability/EEF-CVE-2026-117656](https://osv.dev/vulnerability/EEF-CVE-2026-117656)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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