---
title: "CVE-2026-9093: Casdoor  does not validate the AudienceRestriction element in SAML assertions"
url: https://erroneo.us/security/cve/CVE-2026-9093/
description: "CVE-2026-9093 (github.com/casdoor/casdoor (Go)): In Casdoor versions 2.362.0 and earlier, the SAML service provider implementation does not validate the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-28
date_modified: 2026-07-02
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-9093"
kev: false
cvss: 9.8
epss: 0.00483
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-9093: Casdoor  does not validate the AudienceRestriction element in SAML assertions

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 41: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 41% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/casdoor/casdoor (Go) <= 1.1000.1-0.20260321120606-239e8bd69487, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

In Casdoor versions 2.362.0 and earlier, the SAML service provider implementation does not validate the AudienceRestriction element in SAML assertions. The buildSp function in object/samlsp.go never sets AudienceURI on the gosaml2 SAMLServiceProvider struct and never inspects WarningInfo.NotInAudience. This allows assertions issued for other service providers to be accepted by Casdoor.

## Affected packages

- Go `github.com/casdoor/casdoor` <= 1.1000.1-0.20260321120606-239e8bd69487 → fixed: none listed

## Affected products (CVE record)

- Casdoor Casdoor: <= 2.362.0

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.48% probability of exploitation activity in the next 30 days; percentile 41.

## Sources

- [GitHub Advisory GHSA-3w4h-g9f5-j84p](https://github.com/advisories/GHSA-3w4h-g9f5-j84p)
- [CVE.org record CVE-2026-9093](https://www.cve.org/CVERecord?id=CVE-2026-9093)
- [NVD entry CVE-2026-9093](https://nvd.nist.gov/vuln/detail/CVE-2026-9093)
- [kb.cert.org](https://kb.cert.org/vuls/id/780781)

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Source page: https://erroneo.us/security/cve/CVE-2026-9093/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt