---
cve: "CVE-2026-45793"
severity: "HIGH"
cvss: 7.5
epss: "80%"
vendor: "composer"
kev: false
exploited: false
published: "2026-07-15 17:16:48"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T15:27:09+02:00"
---

# CVE-2026-45793

> 7.5 HIGH · 🧪 PoC

## Beschreibung

Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\IO\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9_]+$ and interpolates rejected tokens into an UnexpectedValueException; GitHub Actions GITHUB_TOKEN values using the ghs__ format can contain -, fail validation, and be disclosed to stderr or CI logs. This issue is fixed in versions 1.10.28, 2.2.28, and 2.9.8.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 8db20864c72cc97be1d803efe10dc84abf533a05 (Commit)
- 5104b27aaa735dcbadc1bd65f5ff1ef3552c543a (Commit)

## Referenzen

- <https://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2>
- <https://github.com/composer/composer/pull/12853>
- <https://github.com/composer/composer/pull/12855>
- <https://github.com/composer/composer/commit/3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039>
- <https://github.com/composer/composer/commit/65e6390c49f1a11cd8b660d81822086db51fe2d1>
- <https://github.com/composer/composer/commit/e66c8fdb7ff5409bd2f358c5f194038e49e93714>
- <https://github.com/composer/composer/releases/tag/1.10.28>
- <https://github.com/composer/composer/releases/tag/2.2.28>
- <https://github.com/composer/composer/releases/tag/2.9.8>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45793) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_