PT-2026-42557 · Unknown · Concrete Cms

0X4C616E · CVE-2026-7887 · Published 2026-05-21 · Updated 2026-05-22

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1

Description The OAuth 2.0 Authorization-Code Handler fails to verify account status. This allows users who are suspended, banned, or terminated employees, specifically those with the uIsActive variable set to 0, to successfully authenticate via OAuth and obtain valid API tokens.

Recommendations Update to a version newer than 9.5.0.

Exploit

Fix

Weakness Enumeration

CWE-1287

Related Identifiers

CVE-2026-7887

GHSA-F54H-78C9-C24H

Affected Products

Concrete Cms

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7887.json · Exploit
• https://osv.dev/vulnerability/CVE-2026-7887 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-7887 · Security Note
• https://osv.dev/vulnerability/GHSA-f54h-78c9-c24h · Vendor Advisory
• https://github.com/concretecms/concretecms · Note
• https://twitter.com/CVEnew/status/2057783210717687985 · Twitter Post
• https://t.me/cveNotify/164641 · Telegram Post
• https://twitter.com/infoflowcloud/status/2057785038117179691 · Twitter Post
• https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes · Note