---
cve: "CVE-2026-12049"
severity: "MEDIUM"
cvss: 5.3
epss: "22%"
vendor: "pgadmin.org"
kev: false
exploited: false
published: "2026-06-19 00:16:47"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T01:51:13+02:00"
---

# CVE-2026-12049

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

Open redirect in pgAdmin 4's multi-factor authentication flow. The MFA validate and register endpoints honoured the user-supplied 'next' query/form parameter without confirming the target pointed back inside pgAdmin, so an authenticated victim who clicked /mfa/validate?next= -- a link typically delivered by phishing -- would be sent to an attacker-controlled host directly out of the trusted auth flow.

The defect is a trusted-domain redirect, not a privilege bypass: the attacker gains no read/write access to pgAdmin or the victim's database, but the redirect launders the attacker's destination through pgAdmin's URL, which raises the success rate of credential-phishing follow-on against the victim.

Fix introduces a same-origin _is_safe_redirect_url helper and gates every MFA redirect that consumes user-supplied 'next' values through it. The helper allows only relative paths and absolute URLs whose scheme is http(s) and whose host matches the current request host; it rejects external hosts in absolute and protocol-relative form, non-http schemes (javascript:, data:, mailto:), userinfo tricks (http://localhost@attacker/), and backslash variants that some browsers normalize to forward slashes. Unsafe targets fall back to the internal browser index. A dedicated regression test exercises each accept/reject category and the original reporter PoC.

This issue affects pgAdmin 4: from 6.0 before 9.16.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 888a053231923e6704b56165cf248db056252144 (Commit)
- fff6a481854b07822c2b54e8181e6a9076d204cd (Commit)

## Referenzen

- <https://github.com/pgadmin-org/pgadmin4/issues/10028>
- <https://github.com/pgadmin-org/pgadmin4/commit/fff6a481854b07822c2b54e8181e6a9076d204cd>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-12049) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_