EUVD-2026-82941
GHSA-9rr2-pvrh-g3pm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network injection (PR:N per description), payload fires only when a privileged manager views the order (UI:R), executing in a different security context (S:C) enabling rogue-admin creation and data theft (C:H/I:H, A:N).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Concrete CMS Community Store before 2.7.8 renders customer-supplied order fields without HTML escaping in checkout and admin views. Unauthenticated attackers can store script payloads in billing name, email, or phone fields that execute in authenticated manager sessions to create rogue accounts or exfiltrate data.
Articles & Coverage 1
AnalysisAI
Stored cross-site scripting in the Concrete CMS Community Store package before 2.7.8 lets an unauthenticated shopper plant script payloads in customer-supplied checkout fields - billing first/last name, email, and phone - which the storefront renders without HTML escaping in default order-slip, cart, and checkout templates. The injected script lies dormant until an authenticated store manager or administrator opens the affected order in the order slip or admin order views, at which point it executes in their privileged session and can create rogue accounts or exfiltrate store and customer data. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a Concrete CMS Community Store instance older than 2.7.8 with the standard checkout flow reachable by customers. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine stored XSS with a serious exploitation model: the payload is planted by an UNAUTHENTICATED attacker via customer-supplied checkout fields (billing name, email, phone) and later executes inside an AUTHENTICATED store-manager/admin session that views the order slip or admin order views. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade the Community Store package to v2.7.8 (release https://github.com/concretecms-community-store/community_store/releases/tag/v2.7.8), which wraps every previously raw echo of order attributes in Concrete's h() escaping helper; the corresponding upstream fix is commit 2a802d6a5717f4e351ef21fdf8bdaf8061c40109 (https://github.com/concretecms-community-store/community_store/commit/2a802d6a5717f4e351ef21fdf8bdaf8061c40109), which can be back-ported manually if an immediate package upgrade is not possible - note that hand-patching template files will be overwritten by the next package update, so record the change. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, confirm whether Concrete CMS Community Store is deployed anywhere in the estate and identify every instance running a version below 2.7.8; inventory which of those accept guest or customer-supplied checkout input and restrict administrative access to the order management and order-slip views to essential staff only. …
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External POC / Exploit Code
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