---
cve: "CVE-2026-91165"
severity: "LOW"
cvss: 2.4
epss: "0.2%"
vendor: "warp-tech"
kev: false
exploited: false
published: "2026-09-21 19:17:15"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T20:06:45+02:00"
---

# CVE-2026-91165

> 2.4 LOW · 🧪 PoC

## Beschreibung

Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. Prior to 0.27.6, the response_mode=form_post SSO return path in warpgate-protocol-http/src/api/sso_provider_list.rs uses serde_json::to_string inside ReturnToSsoPostResponse without neutralizing a script-closing sequence. The vulnerable value can enter the script block through the attacker-controlled next redirect parameter stored by warpgate-protocol-http/src/api/sso_provider_detail.rs or through IdP-derived error messages that make_redirect_url concatenates without URL encoding. The IdP-derived path is reachable when the attacker controls a configured identity provider, or when the attacker controls the email or username claim on an attacker-controlled account and the configured identity provider permits the required unvalidated claim format. A victim must complete the form_post SSO flow for the injected markup to be rendered. The Warpgate Content-Security-Policy blocks injected JavaScript and event handlers, so the demonstrated impact is content spoofing, a false login form, or a meta refresh rather than script execution. This issue is fixed in version 0.27.6.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- e94425a08f501383a67316673749dcbd637c6ce3 (Commit)
- 3f166ef2fb27d3e6785df315fdc39914f0568404 (Commit)

## Referenzen

- <https://github.com/warp-tech/warpgate/security/advisories/GHSA-vvpj-p7j8-4rv4>
- <https://github.com/warp-tech/warpgate/commit/e94425a08f501383a67316673749dcbd637c6ce3>
- <https://github.com/warp-tech/warpgate/releases/tag/v0.27.6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-91165) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_