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CVE-2026-45793— Composer: Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs

Quick assessment

Affected
composer composer
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Composer是Composer组织开源的一个应用软件。提供一个声明,管理和安装PHP项目的依赖项。 Composer 1.10.28之前版本、2.2.28之前版本和2.9.8之前版本存在信息泄露漏洞，该漏洞源于Composer\IO\BaseIO::loadConfiguration()函数中正则表达式验证GitHub OAuth令牌不当，导致令牌验证失败时被泄露至stderr或CI日志。以下版本受到影响：1.10.28之前版本、2.2.28之前版本和2.9.8之前版本。

CVSS 7.5 · High EPSS 1.02% · P62

Affected Version Matrix 3

VendorProduct Version RangeStatus
composer composer >= 1.0, < 1.10.28 affected
>= 2.0.0, < 2.2.28 affected
>= 2.3.0, < 2.9.8 affected
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I. Basic Information for CVE-2026-45793

Vulnerability Information
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Vulnerability Title
Composer: Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs
Source: CVE Program / CVE List V5
Vulnerability Description
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_<id>_<base64url-JWT> 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Composer 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Composer是Composer组织开源的一个应用软件。提供一个声明,管理和安装PHP项目的依赖项。 Composer 1.10.28之前版本、2.2.28之前版本和2.9.8之前版本存在信息泄露漏洞，该漏洞源于Composer\IO\BaseIO::loadConfiguration()函数中正则表达式验证GitHub OAuth令牌不当，导致令牌验证失败时被泄露至stderr或CI日志。以下版本受到影响：1.10.28之前版本、2.2.28之前版本和2.9.8之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
composer composer >= 1.0, < 1.10.28 -

II. Public POCs for CVE-2026-45793

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6265 chars
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III. Intelligence Information for CVE-2026-45793

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Patches & Fixes for CVE-2026-45793 (6)

Vendor Advisories for CVE-2026-45793 (1)

Vendor Pages for CVE-2026-45793 (2)

IV. Related Vulnerabilities

Same product: composer
Same vendor: composer
Same weakness: CWE-200

V. Comments for CVE-2026-45793

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