---
title: "Security digest: May 28, 2026"
url: https://erroneo.us/security/2026-05-28/
description: "May 28, 2026 vulnerability digest: 1 brief (Oracle EBS Payments CVE-2026-46817: Exploited…); 5 critical advisories (Go). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2026-05-28
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: May 28, 2026

1 editorial brief and 5 critical advisories.

## Take stock

- Act now: Oracle EBS Payments CVE-2026-46817: Exploited Takeover . Every organization running Oracle E-Business Suite 12.2.3 through 12.2.15, most urgently where any EBS web tier is reachable from the internet or from partner networks.
- Go: 5 critical advisories ( github.com/casdoor/casdoor ). Check with govulncheck ./... .
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Editorial briefs

- **Act now** [Oracle EBS Payments CVE-2026-46817: Exploited Takeover](https://erroneo.us/security/briefs/oracle-ebs-payments-cve-2026-46817-kev/index.md): If you run Oracle E-Business Suite 12.2 without the May 2026 Critical Security Patch Update, patch now; this is an unauthenticated, low-complexity takeover of the payments module and it has been exploited since late June.

## Known exploited (CISA KEV)

None.

## Critical advisories

- [CVE-2026-9098](https://erroneo.us/security/cve/CVE-2026-9098/index.md) Casdoor SAML callback handler accepts any well-formed SAMLResponse sent to /api/acs without verifying that it corresponds to an AuthnRequest — Go github.com/casdoor/casdoor <= 1.1000.1-0.20260321120606-239e8bd69487 → no fix
- [CVE-2026-9090](https://erroneo.us/security/cve/CVE-2026-9090/index.md) Casdoor has an authentication bypass — Go github.com/casdoor/casdoor <= 1.1000.1-0.20260321120606-239e8bd69487 → no fix
- [CVE-2026-9094](https://erroneo.us/security/cve/CVE-2026-9094/index.md) Casdoor: GetTokenExchangeToken bypass through lack of cross-organization JWT signature check — Go github.com/casdoor/casdoor < 2.387.0 → 2.387.0
- [CVE-2026-9093](https://erroneo.us/security/cve/CVE-2026-9093/index.md) Casdoor  does not validate the AudienceRestriction element in SAML assertions — Go github.com/casdoor/casdoor <= 1.1000.1-0.20260321120606-239e8bd69487 → no fix
- [CVE-2026-9097](https://erroneo.us/security/cve/CVE-2026-9097/index.md) Casdoor doesn't verify that a JWT used for token exchange is still active — Go github.com/casdoor/casdoor <= 1.1000.1-0.20260321120606-239e8bd69487 → no fix

---
Source page: https://erroneo.us/security/2026-05-28/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt