# CVE-2026-9093: CVE-2026-9093

> Casdoor fails to validate SAML AudienceRestriction, allowing attackers to use assertions from other providers to bypass authentication and take over accounts.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 May 2026
- **Updated:** 2 Jun 2026
- **Also known as:** GHSA-3w4h-g9f5-j84p, GO-2026-5894

## What is CVE-2026-9093?

CVE-2026-9093 is a critical authentication bypass vulnerability in Casdoor, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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/saml_sp.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.

## Which versions are affected by CVE-2026-9093?

3 open source packages ship an affected version, including github.com/casdoor/casdoor.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/casdoor/casdoor` | Go | All versions | None |
| `github.com/casdoor/casdoor` | Go | All versions to 1.1000.1-0.20260321120606-239e8bd69487 | None |
| `github.com/casdoor/casdoor` | Go | All versions to 1.1000.1-0.20260321120606-239e8bd69487 | None |

## How do I fix CVE-2026-9093?

Upgrade to a fixed version.

## Is CVE-2026-9093 being exploited?

There is no known exploitation of CVE-2026-9093 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9093 and fix it if it is affected.

What it is: CVE-2026-9093 is a critical authentication bypass vulnerability in Casdoor, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-9093 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/casdoor/casdoor (Go): affected all versions; no fix listed
- github.com/casdoor/casdoor (Go): affected all versions up to 1.1000.1-0.20260321120606-239e8bd69487; no fix listed
- github.com/casdoor/casdoor (Go): affected all versions up to 1.1000.1-0.20260321120606-239e8bd69487; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-9093/ (Markdown: https://insights.sbomify.com/CVE-2026-9093/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9093
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9093
- OSV: https://osv.dev/vulnerability/CVE-2026-9093

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9093/
Summaries are generated and may contain mistakes; the official description above is the record.