---
cve: "CVE-2026-55789"
severity: "HIGH"
cvss: 8.5
epss: "30%"
vendor: "logto-io"
kev: false
exploited: false
published: "2026-07-10 20:16:47"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T04:55:25+02:00"
---

# CVE-2026-55789

> 8.5 HIGH · 🧪 PoC

## Beschreibung

Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's self-hosted SAML application IdP built the signed SAML response and assertion by string-substituting user-controlled profile attributes such as name, email, and custom attribute-mapping values into element-text placeholders of a SAML XML template using samlify 2.10.0, which left those placeholders unescaped. An authenticated low-privilege user could place XML markup in a profile attribute so Logto signed a forged SAML attribute, such as an arbitrary role, allowing privilege escalation at relying Service Providers that authorize on SAML attributes. This issue is fixed in version 1.41.0.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 9097054860f0d638d90778d3dcde2ba050b844b6 (Commit)
- 91e55698a42f99438cd41ec2b16a1fc51dbdab8a (Commit)

## Referenzen

- <https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63>
- <https://github.com/logto-io/logto/pull/9107>
- <https://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6>
- <https://github.com/logto-io/logto/releases/tag/v1.41.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55789) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_