EUVD-2026-29838Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/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
Network GraphQL call with low complexity but requires the manage:users permission (PR:H); yields total account/system compromise so C/I/A all High; scope Unchanged as escalation stays within the app's authorization context.
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
4DescriptionGitHub Advisory
Wiki.js is an open source wiki app built on Node.js. Prior to 2.5.313, the users.update GraphQL mutation accepts an arbitrary groups array and applies it directly to the database with no validation of the group IDs supplied. The resolver passes the caller's arguments straight to the model without any ownership check or restriction on which groups can be assigned. A user with manage:users - a permission typically delegated to wiki moderators for account management - can set groups:[1] on their own account to self-assign to the Administrators group. After re-authentication, the fresh JWT carries manage:system, granting full site administrator access in a single mutation call. This vulnerability is fixed in 2.5.313.
AnalysisAI
Vertical privilege escalation in Wiki.js before 2.5.313 lets an account-management moderator promote themselves to full site administrator through the users.update GraphQL mutation. Because the resolver applies a caller-supplied groups array to the database with no ownership or group-ID validation, any user holding the manage:users permission can set groups:[1] on their own account and, after re-authentication, receive a JWT carrying manage:system. SSVC rates technical impact as total; publicly available advisory exists (GHSA-cq3g-mwrg-v2rv) but no public exploit code and no active exploitation, with EPSS at a low 0.04%.
Technical ContextAI
Wiki.js is an open-source Node.js wiki platform that exposes its management surface through a GraphQL API and enforces authorization via permission strings (e.g. manage:users, manage:system) embedded in a signed JWT that is refreshed on login. The flaw is a CWE-269 Improper Privilege Management defect: the users.update mutation resolver passes the caller's arguments - including the target group membership array - straight to the user model without checking whether the caller is entitled to assign those groups. Group ID 1 is the built-in Administrators group, whose membership grants manage:system. The affected component is identified by CPE cpe:2.3:a:requarks:wiki, matching the Requarks 'wiki' (Wiki.js) product across all versions prior to the fix.
RemediationAI
Upgrade to Wiki.js 2.5.313, which adds validation of the groups supplied to the users.update mutation (Vendor-released patch: 2.5.313); see the advisory at https://github.com/requarks/wiki/security/advisories/GHSA-cq3g-mwrg-v2rv. Until the upgrade is applied, reduce exposure by revoking the manage:users permission from any group whose members are not fully trusted administrators (the trade-off is that account-management delegation to moderators is lost, so those tasks fall back to admins), and audit membership of the Administrators group (group ID 1) plus recent user-update activity to detect any self-promotion that may already have occurred. Because a compromised account only needs a single mutation call, treat manage:users as equivalent to full admin until patched.
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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