EUVD-2026-77368
GHSA-v8g7-44pf-w6m4
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Network vector; AC:H for JWKS disclosure prerequisite; PR:L because valid authentication is required before spoofing is possible; no availability impact.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
3DescriptionCVE.org
Authentication bypass by spoofing vulnerability in Apache Syncope.
When the configured JWKS settings for internal JWT authentication are disclosed (at least protocol and key), an attacker can spoof another user's privileges after completing a successful authentication and obtaining a valid JWT.
This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 through 4.0.7, from 4.1.0-M0 through 4.1.2.
Users are recommended to upgrade to version 4.0.8 / 4.1.3, which fix this issue.
AnalysisAI
JWT privilege-spoofing in Apache Syncope allows an authenticated attacker to impersonate any other user if the internal JWKS configuration (at minimum the signing protocol and key) has been disclosed. The attacker must first complete a legitimate authentication and obtain a valid JWT, then leverage the disclosed JWKS material to forge tokens carrying another user's identity claims. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two specific conditions must both be met: (1) The attacker must hold valid credentials for at least one Syncope account and complete a successful authentication to obtain a legitimate JWT - unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | No vendor-supplied CVSS vector is provided for this CVE, so risk must be inferred from the description. … 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 | Upgrade Apache Syncope to version 4.0.8 or 4.1.3, which are the vendor-confirmed fixed releases per the Apache mailing list advisory at https://lists.apache.org/thread/3t3om8mny7ng52q053pdzpmtdtosnqoo. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Apache Syncope
View allSQL injection in Apache Syncope allows an administrator holding sufficient entitlements to execute arbitrary SQL through
Privilege escalation in Apache Syncope's identity-management engine lets a self-service user grant themselves defined Ro
SQL injection in Apache Syncope's Task search endpoint allows an authenticated administrator to execute arbitrary SQL th
Server-Side Request Forgery in Apache Syncope lets a low-privileged authenticated user abuse the Connectors and Resource
Incorrect authorization in Apache Syncope's delegated administration module allows an authenticated delegated administra
OIDC client secret exposure in Apache Syncope enables any authenticated user to retrieve complete OIDC provider configur
Sensitive AES key material is written in plaintext to Apache Syncope application logs under a specific misconfiguration
CSV formula injection in Apache Syncope allows authenticated low-privilege users to embed spreadsheet formula payloads i
Code execution via Groovy sandbox bypass in Apache Syncope 3.0 through 3.0.16, 4.0 through 4.0.5, and 4.1.0 allows a hig
Remote code execution in Apache Syncope's connector subsystem allows an administrator holding sufficient entitlements to
Remote code execution in Apache Syncope's workflow engine lets an administrator holding sufficient entitlements run arbi
Groovy sandbox escape in Apache Syncope's Implementations feature lets an administrator holding Implementation entitleme
Same weakness CWE-290 – Authentication Bypass by Spoofing
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today