huntrule

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
AnalysisDetection

ATT&CK techniques

Initial Access

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. 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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Possible Next.js Middleware Auth Bypass via X-Middleware-Subrequest Header (CVE-2025-29927)
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Webserver URI Probe for Workspace ONE Access Auth Bypass Attempt (CVE-2022-31656)
Pivot detection · T1190 · 9 related

Changelog

v5
  1. v5
    Candidate ingested via manual entry.2026-07-31
  2. v4
    Candidate ingested via manual entry.2026-07-31
  3. v3
    Candidate ingested via manual entry.2026-07-31
  4. v2
    Candidate ingested via manual entry.2026-07-31
  5. 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.