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CVE-2026-34839· NVD / CVE Program· CNA GitHub_M

Glances Vulnerable to Cross-Origin Information Disclosure via Unauthenticated REST API (/api/4) due to Permissive CORS

Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.

HighCVSS 7.7 · v4.0—No exploit Fix available
Published
Apr 20, 2026
Updated
Jun 17, 2026
EPSS
0.5% · 38th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.7
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
nicolargoglances

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • nicolargo glancesbefore 4.5.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • nicolargo glances

    • < 4.5.4affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12glancesall versions—
Debian:14glancesbefore 4.5.4+dfsg-14.5.4+dfsg-1
openSUSE:Tumbleweedpython-Glancesbefore 4.5.4-1.14.5.4-1.1
PyPIglancesbefore 4.5.44.5.4

Same product

nicolargo: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-32633Glances's Browser API Exposes Reusable Downstream Credentials via `/api/4/serverslist`
    36Monitor
  • CVE-2026-32611Glances has a SQL Injection in DuckDB Export via Unparameterized DDL Statements
    36Monitor
  • CVE-2026-62982Glances: Incomplete fix of CVE-2026-32608: action-template sanitizer is bypassed by nested stat values (process 'cmdline') → OS command injection
    35Monitor
  • CVE-2026-68518Glances: Command injection bypass of action-template sanitizer via cross-field shell-operator reconstruction
    35Monitor
  • CVE-2026-32596Glances exposes the REST API without authentication
    35Monitor
  • CVE-2026-30928Glances Exposes Unauthenticated Configuration Secrets
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:glances4.5.4+dfsg-1 · Debian:14Package registry (OSV)
opensuse:python-Glances4.5.4-1.1 · openSUSE:TumbleweedPackage registry (OSV)
PyPI:glances4.5.4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-3263333 days apartGlances's Browser API Exposes Reusable Downstream Credentials via `/api/4/serverslist`
    36Monitor
  • CVE-2026-3259633 days apartGlances exposes the REST API without authentication
    35Monitor
  • CVE-2026-3092841 days apartGlances Exposes Unauthenticated Configuration Secrets
    34Monitor
  • CVE-2026-3260933 days apartGlances has Incomplete Secrets Redaction: /api/v4/args Endpoint Leaks Password Hash and SNMP Credentials
    30Monitor
  • CVE-2026-68520119 days apartGlances: as_dict_secure() Value-Level Bypass Leaks Credentials in URL Values via /api/4/config
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-3364118 days apartGlances Vulnerable to Command Injection via Dynamic Configuration Values
    31Monitor
  • CVE-2026-355870 days apartGlances IP Plugin has SSRF via public_api that leads to credential leakage
    29Monitor
  • CVE-2026-3260833 days apartGlances has a Command Injection via Process Names in Action Command Templates
    28Monitor
  • CVE-2026-355880 days apartGlances has CQL Injection in its Cassandra Export Module via Unsanitized Config Values
    25Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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

nvd-secondary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records