Microsoft Azure Storage Library: Injection leading to unauthorized deletion
Summary
The Azure Storage Blobs client library for Java and the azure-storage-blob-batch library do not properly neutralize special elements in values used by a downstream component. An authenticated attacker who can supply a blob tag condition to an application using the affected library can add unauthorized deletion options to a permitted storage operation, so that recovery snapshots or blobs are deleted even though the application did not intend this. The attack requires network access and low privileges, and no user interaction; the library itself opens no listening service.
Affected
- azure-storage-blob-batch: 1.0.0 to before 12.31.2
- Azure Storage Blobs client library for Java: version range unknown (not specified by the vendor)
Fixed in
- Fixed version: Unknown. Check the MSRC advisory for the current Security Update for azure-storage-blob-batch and the Java client library.
Workaround
- No vendor workaround published.
- Limit user input that can reach blob tag conditions and blob delete options in your applications (own recommendation, not a vendor statement).
Exploitation
- Public proof-of-concept: none found.
- Exploited in the wild: no evidence found.
- Not listed in the CISA KEV catalog.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- MSRC temporal score uses exploit maturity Unproven (E:U).
Our recommendation
- Inventory Java applications and dependencies for azure-storage-blob and azure-storage-blob-batch.
- Check the MSRC advisory and update both libraries to the latest release as soon as a fixed version is confirmed.
- Until then, validate or restrict user input used in blob tag conditions and delete options.
- Priority: medium for SMEs with custom Java/Azure applications; low if no software is built on these SDKs.
Information from Microsoft (Patch Tuesday October 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide: CVE-2026-88094 msrc.microsoft.com
- OpenCVE: CVE-2026-88094 app.opencve.io
- Vulners CVE record: CVE-2026-88094 vulners.com
- Rapid7: Patch Tuesday October 2026 www.rapid7.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 19:18.
Original description (NVD)
Improper neutralization of special elements in output used by a downstream component ('injection') in Azure Storage Library allows an authorized attacker to elevate privileges over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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