Security Resilience

CVE-2026-82020

Public PoC
Published
28 August 2026
Modified
08 September 2026
CVSS Score v4 7.6
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/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 0.0043 36th percentile
Risk Priority 55 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-2026-82020 is a high-severity Files or Directories Accessible to External Parties (CWE-552) vulnerability. Its CVSS base score is 7.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Data from Cloud Storage (T1530); ranked at the 36th 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-3 (Access Enforcement) and AC-6 (Least Privilege) — 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

Hermes Agent 0.16.0 prior to 0.17.0 contains an improper path restriction vulnerability that allows attackers who can influence ingested message content to overwrite the credential store by bypassing sensitive-path guards that excluded the auth.json file. Attackers can craft malicious messages…

more

directing the agent's file-write tooling to overwrite the credential store without triggering any path-based protection, enabling credential tampering or unauthorized access.

CWE(s)
CWE-552

Related Threats

MITRE ATT&CK Enterprise Techniques

T1530 Data from Cloud Storage Collection
Adversaries may access data from cloud storage.
attack.mitre.org →
T1552.006 Group Policy Preferences Credential Access
Adversaries may attempt to find unsecured credentials in Group Policy Preferences (GPP).
attack.mitre.org →
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 →
T1119 Automated Collection Collection
Once established within a system or network, an adversary may use automated techniques for collecting internal data.
attack.mitre.org →
T1213 Data from Information Repositories Collection
Adversaries may leverage information repositories to mine valuable information.
attack.mitre.org →
T1552.001 Credentials In Files Credential Access
Adversaries may search local file systems and remote file shares for files containing insecurely stored credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-5101Shared CWE-552
CVE-2025-22369Shared CWE-552
CVE-2026-75889Shared CWE-552
CVE-2023-47202Shared CWE-552
CVE-2023-28375Shared CWE-552
CVE-2024-57452Shared CWE-552
CVE-2023-32684Shared CWE-552
CVE-2024-3913Shared CWE-552
CVE-2025-59976Shared CWE-552
CVE-2024-48838Shared CWE-552

Affected Assets

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 5 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V8.4.2

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match

AC-3 directly enforces authorization checks on access to files and directories, stopping unauthorized external exposure.

AC-6 Least Privilege good match

AC-6 limits granted privileges, reducing the chance that files or directories become reachable by external parties.

AC-4 Information Flow Enforcement partial match

AC-4 enforces information flow rules that can block unauthorized external access to files or directories.

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.

PR.AA-05 mostly match
blocks

Enforcing least-privilege permissions and authorization policies directly prevents unauthorized file/directory exposure.

PR.IR-01 mostly match
blocks

Logical segmentation and access protections stop external parties from reaching files that should remain internal.

PR.DS-01 partial match
blocks

Data-at-rest protections such as encryption or ACLs reduce the impact of unintended file exposure.

PR.PS-01 partial match
blocks

Hardened configuration baselines commonly include file-system permission settings that limit external access.

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.5.18 Access rights mostly match
removes
A.8.3 Information access restriction mostly match
removes

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).

Oracle Linux 8 (2 rules)
  • V-248579 OL 8 must restrict access to the kernel message buffer. blocks CWE-552
  • V-248597 There must be no "shosts.equiv" files on the OL 8 operating system. blocks CWE-552

References