Is there a public PoC exploit available for CVE-2026-11521?

Yes, a public proof-of-concept exploit is available for CVE-2026-11521. Prioritise patching immediately. EPSS: 0.0%.

Bank Management Springboot CVE-2026-11521

Q: What is the CVSS score of CVE-2026-11521?

CVE-2026-11521 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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. EPSS exploitation probability: 0.0%.

EUVD-2026-35075 LOW

Improper Authorization (CWE-285)

2026-06-08 VulDB

GHSA-4vv9-c3hj-rh83

Authentication Bypass Java

2.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.1 LOW

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Jun 08, 2026 - 15:37 NVD

MEDIUM LOW

CVSS changed

Jun 08, 2026 - 15:37 NVD

6.3 (MEDIUM) 2.1 (LOW)

Analysis Generated

Jun 08, 2026 - 14:52 vuln.today

DescriptionCVE.org

A security vulnerability has been detected in Mohammed-eid35 bank-management-system-springboot up to 7b9bcc65ad7df3db29af71aed9bb500e5f24d948. This affects an unknown part of the file src/main/java/com/alien/bank/management/system/controller/TransactionController.java of the component Transaction Endpoint. Such manipulation leads to improper authorization. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. This product takes the approach of rolling releases to provide continious delivery. Therefore, version details for affected and updated releases are not available. The project was informed of the problem early through an issue report but has not responded yet.

AnalysisAI

Improper authorization in Mohammed-eid35's bank-management-system-springboot exposes the Transaction Endpoint to low-privileged authenticated remote attackers, enabling unauthorized access to or manipulation of financial transaction records belonging to other users. All versions up to commit 7b9bcc65ad7df3db29af71aed9bb500e5f24d948 are affected, with publicly available exploit code disclosed via GitHub issue #8. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Obtain low-privilege application account

Delivery

Send crafted HTTP request to Transaction Endpoint

Exploit

Supply manipulated resource identifier in request

Execution

Bypass ownership authorization check in TransactionController.java

Impact

Access or modify victim user's transaction data

Access

Obtain low-privilege application account

Delivery

Send crafted HTTP request to Transaction Endpoint

Exploit

Supply manipulated resource identifier in request

Execution

Bypass ownership authorization check in TransactionController.java

Impact

Access or modify victim user's transaction data

Vulnerability AssessmentAI

Exploitation	The CVSS vector PR:L confirms that a low-privilege authenticated account on the target application is required - unauthenticated exploitation is not supported by available data. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 3.1 base score of 6.3 (Medium) reflects network reachability (AV:N), low attack complexity (AC:L), low-privilege authentication required (PR:L), no user interaction (UI:N), and partial impacts across confidentiality, integrity, and availability (C:L/I:L/A:L/S:U). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker registers or obtains a low-privileged customer account on the target application, then sends a crafted HTTP request to the Transaction Endpoint substituting another user's transaction or account identifier in the request parameters - the server processes the request without validating that the authenticated user owns the referenced resource. A publicly available proof-of-concept documented in GitHub issue #8 demonstrates this technique, lowering the technical bar significantly. …
Remediation	No vendor-released patch has been identified at time of analysis - the project maintainer has not responded to the responsible disclosure submitted via GitHub issue, and RL:X in the CVSS temporal vector confirms no remediation level is defined. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-11521 vulnerability details – vuln.today

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