Webserver URI Probe for Workspace ONE Access Auth Bypass Attempt (CVE-2022-31656)

Alerts on webserver requests to Workspace ONE Access containing a URI query pattern linked to CVE-2022-31656 exploitation.

FreeReviewedSigma · High · v5

Category: webserver
Author: Nasreddine Bencherchali (Nextron Systems) (SigmaHQ), DRL 1.1
Published: 2022-08-12
Updated: 2026-07-31

Analysis Detection

ATT&CK techniques

Initial Access

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule identifies HTTP requests whose URI query contains the specific path pattern '/SAAS/t/_/;/', consistent with probing for the VMware Workspace ONE Access authentication bypass referenced by CVE-2022-31656. Attackers may use network access to the application UI to attempt to obtain elevated access without valid authentication. The rule relies on webserver request telemetry, specifically the HTTP query string (cs-uri-query) captured in logs.

Reporting behind it

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Webserver URI Probe for Workspace ONE Access Auth Bypass Attempt (CVE-2022-31656)

Pivot detection · T1190 · 9 related

Changelog

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

webserver-attempts-exploiting-cve-2022-31656-in-vmware-workspace-one-access-fcf1101d

title: Webserver URI Probe for Workspace ONE Access Auth Bypass Attempt (CVE-2022-31656)
id: 85527c23-c9c8-44bc-a87f-9b41dd618cc3
status: test
description: This rule identifies HTTP requests whose URI query contains the specific path pattern '/SAAS/t/_/;/', consistent with probing for the VMware Workspace ONE Access authentication bypass referenced by CVE-2022-31656. Attackers may use network access to the application UI to attempt to obtain elevated access without valid authentication. The rule relies on webserver request telemetry, specifically the HTTP query string (cs-uri-query) captured in logs.
references:
  - https://petrusviet.medium.com/dancing-on-the-architecture-of-vmware-workspace-one-access-eng-ad592ae1b6dd
  - https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2022/Exploits/CVE-2022-31656/web_cve_2022_31656_auth_bypass.yml
author: Nasreddine Bencherchali (Nextron Systems), Huntrule Team
date: 2022-08-12
modified: 2023-01-02
tags:
  - attack.initial-access
  - attack.t1190
  - cve.2022-31656
  - detection.emerging-threats
logsource:
  category: webserver
detection:
  selection:
    cs-uri-query|contains: /SAAS/t/_/;/
  condition: selection
falsepositives:
  - Vulnerability scanners
level: high
license: DRL-1.1
related:
  - id: fcf1101d-07c9-49b2-ad81-7e421ff96d80
    type: derived

Convert

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