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Apache Syncope EUVDEUVD-2026-77459

| CVE-2026-77051 CRITICAL
SQL Injection (CWE-89)
2026-09-14 security@apache.org GHSA-qq7g-v262-hrq8
9.8
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
9.8 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.2 HIGH

Network-reachable admin API with low complexity, but exploitation demands an administrator with entitlements so PR:H; stacked-query arbitrary SQL justifies full C:H/I:H/A:H.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Metadata Corrected
Sep 16, 2026 - 09:40 vuln.today
tag: Syncope added
Analysis Generated
Sep 15, 2026 - 10:39 vuln.today
CVSS changed
Sep 14, 2026 - 20:22 NVD
9.8 (CRITICAL)
CVE Published
Sep 14, 2026 - 13:18 cve.org
CRITICAL 9.8
CVE Published
Sep 14, 2026 - 13:18 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Apache Syncope.

An administrator with adequate entitlements can achieve execution of arbitrary SQL via stacked queries, leveraging unsanitized entityKey and opEvent parameters.

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

Stacked SQL injection in Apache Syncope (3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2) allows an authenticated administrator holding adequate entitlements to execute arbitrary SQL against the backend database by supplying malicious content in the unsanitized entityKey and opEvent parameters, which are concatenated into statements that also allow stacked (multi-statement) execution. The vendor assigned a 9.8 score with a PR:N vector, but the explicitly stated gating precondition - a privileged Syncope administrator with the relevant entitlements - means the realistic attack vector is PR:H (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H), so unauthenticated or low-privileged users cannot reach the vulnerable code path. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Requires an authenticated Apache Syncope administrator holding 'adequate entitlements' - this is the explicit gating precondition stated by the vendor, directly contradicting the CVSS PR:N. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals conflict on the single most important axis: privilege. … 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 Apply the vendor fix by upgrading to Apache Syncope 4.0.8 or 4.1.3, which resolve the issue across all affected release trains (users on 3.0.x should migrate to a supported 4.x line). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

For Apache Syncope 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2, within 24 hours inventory all deployments, confirm affected versions, restrict network access to administrative interfaces, review privileged administrator accounts and entitlements, and enable audit logging for entityKey and opEvent inputs plus database multi-statement SQL activity. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2018-1321 HIGH POC
7.2 Mar 20

An administrator with report and template entitlements in Apache Syncope 1.2.x before 1.2.11, 2.0.x before 2.0.8, and un

CVE-2026-75030 CRITICAL
9.8 Sep 14

Missing authorization in Apache Syncope (3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2) le

CVE-2026-77181 CRITICAL
9.8 Sep 14

Incorrect authorization in Apache Syncope allows a delegated administrator who holds only the ClientApp CREATE entitleme

CVE-2026-73668 CRITICAL
9.8 Sep 14

Cross-realm authorization bypass in Apache Syncope allows an administrator who already holds delegated entitlements in o

CVE-2026-73579 CRITICAL
9.8 Sep 14

Incorrect authorization in Apache Syncope (3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2)

CVE-2020-1961 CRITICAL
9.8 May 04

Vulnerability to Server-Side Template Injection on Mail templates for Apache Syncope 2.0.X releases prior to 2.0.15, 2.1

CVE-2020-1959 CRITICAL
9.8 May 04

A Server-Side Template Injection was identified in Apache Syncope prior to 2.1.6 enabling attackers to inject arbitrary

CVE-2018-1322 MEDIUM POC
4.9 Mar 20

An administrator with user search entitlements in Apache Syncope 1.2.x before 1.2.11, 2.0.x before 2.0.8, and unsupporte

CVE-2020-11977 HIGH
7.2 Sep 15

In Apache Syncope 2.1.X releases prior to 2.1.7, when the Flowable extension is enabled, an administrator with workflow

CVE-2018-17186 HIGH
7.2 Nov 06

An administrator with workflow definition entitlements can use DTD to perform malicious operations, including but not li

CVE-2026-23794 MEDIUM
6.8 Feb 03

Reflected XSS in Apache Syncope's Enduser Login page. An attacker that tricks a legitimate user into clicking a maliciou

CVE-2014-0111 MEDIUM
6.5 Apr 17

Apache Syncope 1.0.0 before 1.0.9 and 1.1.0 before 1.1.7 allows remote administrators to execute arbitrary Java code via

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EUVD-2026-77459 vulnerability details – vuln.today

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