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CVE-2026-45793

HIGH
7.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-45793
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-13 08:19 UTC
Published
2026-07-15 16:22 UTC
Last updated
2026-07-15 18:11 UTC
Primary CWE
CWE-200
CWE-200: Exposure of Sensitive Information to an Unauthorize…
Vendor / Product
composer / composer
Sources
cve.org  ·  NVD

Severity & Metrics

7.5 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
composer composer — >= 1.0, < 1.10.28, >= 2.0.0, < 2.2.28, >= 2.3.0, < 2.9.8
Weakness (CWE)
CWESourceDescription
CWE-200 cna CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.5 HIGH 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References (9)
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