---
cve: "CVE-2026-55770"
severity: "MEDIUM"
cvss: 6.8
epss: "0.5%"
vendor: "openbao"
kev: false
exploited: false
published: "2026-09-15 16:17:15"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-11-01T12:55:10+01:00"
---

# CVE-2026-55770

> 6.8 MEDIUM · 🧪 PoC

## Beschreibung

OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, OpenBao used EscapeLDAPValue, an RFC 4514 distinguished-name escaping function, where RFC 4515 LDAP search-filter escaping was required in sdk/helper/ldaputil/client.go GetUserDN. With the LDAP authentication backend configured for an Active Directory UPNDomain path or UserDN and UserAttr binding, an attacker-controlled username containing filter metacharacters could alter the search predicate and select a different directory entry because EscapeLDAPValue does not neutralize the characters handled by ldap.EscapeFilter. A resulting token could be associated with another LDAP identity and gain access to secrets, policies, or modification capabilities assigned to that identity. This issue is fixed in version 2.5.5.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-09-17 11:59:03
- CNA-CVSS: **6.8** (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

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

## Schwachstellen-Klasse

- **CWE-90** — Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
  The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.

## Angriffsmuster (CAPEC)

- [CAPEC-136 — LDAP Injection](https://capec.mitre.org/data/definitions/136.html) _(Severity: High)_

## Patch verfügbar (OSV)

- 028992583c693c4de6350b8aa52ff85e30375a99 (Commit)
- 10b7825c714c1ef25b6c3c1c2cd6ecd8747c0659 (Commit)

## BSI-Hinweise (deutsch)

- [OpenBao: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2028) — _BSI-Einstufung: mittel_
  Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in OpenBao ausnutzen, um Administratorrechte zu erlangen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen und einen Denial-of-Service-Zustand zu verursachen.

## Referenzen

- <https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9>
- <https://github.com/openbao/openbao/pull/3306>
- <https://github.com/openbao/openbao/pull/3313>
- <https://github.com/openbao/openbao/commit/10b7825c714c1ef25b6c3c1c2cd6ecd8747c0659>
- <https://github.com/openbao/openbao/commit/8077f96bdc02137b0a072146b6f9ca11c96c549c>
- <https://github.com/openbao/openbao/releases/tag/v2.5.5>
- <https://github.com/openbao/openbao/releases/tag/v2.6.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-55770/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_