Cyber Resilience

CVE-2026-76855

Public PoC
Published
15 September 2026
Modified
16 September 2026
CVSS Score v4 7.1
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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
EPSS Score 0.0038 31th percentile
Risk Priority 36 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-76855 is a high-severity Exposure of Private Personal Information to an Unauthorized Actor (CWE-359) vulnerability. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Data from Local System (T1005); ranked at the 31th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to AC-16 (Security and Privacy Attributes) and AC-21 (Information Sharing) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

Netcore NR255-V version 1.5.130703 contains a sensitive information disclosure vulnerability in the audit endpoints handled by l7_web_auth_log_dump_cgi.c, audit_get_cgi.c, and mod_dispatch_auth/plan.json. Attackers can query these audit components to obtain other users' session and browsing history data across sessions.

CWE(s)
CWE-359

Related Threats

MITRE ATT&CK Enterprise Techniques

T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
T1025 Data from Removable Media Collection
Adversaries may search connected removable media on computers they have compromised to find files of interest.
attack.mitre.org →
T1039 Data from Network Shared Drive Collection
Adversaries may search network shares on computers they have compromised to find files of interest.
attack.mitre.org →
T1114 Email Collection Collection
Adversaries may target user email to collect sensitive information.
attack.mitre.org →
T1213 Data from Information Repositories Collection
Adversaries may leverage information repositories to mine valuable information.
attack.mitre.org →
T1530 Data from Cloud Storage Collection
Adversaries may access data from cloud storage.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-53950Shared CWE-359
CVE-2024-13217Shared CWE-359
CVE-2026-25699Shared CWE-359
CVE-2025-66510Shared CWE-359
CVE-2019-25762Shared CWE-359
CVE-2025-43389Shared CWE-359
CVE-2024-13215Shared CWE-359
CVE-2024-40796Shared CWE-359
CVE-2025-10859Shared CWE-359
CVE-2024-11396Shared CWE-359

Affected Assets

—
Netcore NR255-V
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 2 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V10.3.5
  • V10.7.2

Mitigating Controls (NIST 800-53 r5) AI

AC-16 Security and Privacy Attributes partial match

Associates privacy attributes with data objects so that downstream enforcement decisions can block unauthorized access.

AC-21 Information Sharing partial match

Requires explicit verification that a recipient's authorizations match the sensitivity of shared PII.

AC-3 Access Enforcement partial match

Enforces authorizations so that PII is not reachable by unauthorized actors.

AC-6 Least Privilege partial match

Limits granted rights to the minimum needed, reducing the set of actors who can reach private data.

PT-2 Authority to Process Personally Identifiable Information partial match

Documents the legal or consent basis required before any processing of PII occurs.

PT-3 Personally Identifiable Information Processing Purposes partial match

Limits processing to documented purposes, thereby excluding unauthorized uses.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

RC.CO-04 partial match
degrades

CWE-359 does not impair RC.CO-04's ability to issue approved public recovery updates, yet any resulting PII exposure can partially undermine the outcome's overall efficacy and trust.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match
mitigates

Labeling, chain-of-custody, and access-control requirements limit the exposure of private personal information during any transfer method.

A.5.34 Privacy and protection of PII partial match
prevents

Mandating privacy procedures and a designated privacy officer helps ensure that private personal information is not disclosed without proper authorization or necessity.

A.6.6 Confidentiality or non-disclosure agreements partial match
mitigates

The agreements impose enforceable restrictions on the handling of private personal information, thereby decreasing the risk that such data will be exposed to unauthorized parties.

A.7.7 Clear desk and clear screen partial match
mitigates

Clear-desk and clear-screen rules reduce the likelihood that private personal information remains visible or accessible to unauthorized viewers in shared workspaces.

A.7.9 Security of assets off-premises partial match
mitigates

Guidance against shoulder-surfing and viewing data in public places directly lowers the risk that private personal information displayed on mobile or laptop screens will be observed by unauthorized individuals.

A.8.11 Data masking partial match
prevents

Masking or anonymizing personal identifiers limits the amount of private personal information that can be disclosed through application outputs or logs.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (higher-evidence rows only; rows rated `none` are excluded).

Ubuntu 22.04 (1 rule)
  • V-260531 Ubuntu 22.04 LTS must configure the SSH daemon to use FIPS 140-3-approved ciphers to prevent the unauthorized disclosure of information and/or detect changes to information during transmission. prevents CWE-359
Ubuntu 24.04 (1 rule)
  • V-270670 Ubuntu 24.04 LTS must configure the SSH client to use FIPS 140-3 approved ciphers to prevent the unauthorized disclosure of information and/or detect changes to information during transmission. prevents CWE-359

References