# CVE-2026-13772: IBM WebSphere Extreme Scale unsafe reflection in OQL engine

Source: https://junglewise.ai/threats/cve-2026-13772-ibm-websphere-extreme-scale-unsafe-reflection-in-oql-engine  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-30. Updated: 2026-06-30  
License: CC BY 4.0 with a link back

CVE-2026-13772 · Severity: high · CVSS 7.5 · Published 2026-06-30

IBM WebSphere Extreme Scale, a high-performance data caching solution, contains a security flaw in how it processes database-like queries. An authenticated attacker who can influence these queries can force the system to execute unauthorized code, potentially leading to a full takeover of the server. This risk is primarily present in environments where the software is used as a 'Simple Grid' and processes dynamic user-influenced queries.

Technologies: [IBM Websphere Extreme Scale](https://junglewise.ai/threats/technologies/websphere-extreme-scale). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-13772 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-13772 being exploited in the wild.

**How severe is CVE-2026-13772?** High severity, with a CVSS score of 7.5, published 30 June 2026.

**Which products and versions are affected?** IBM Websphere Extreme Scale 8.6.1.0 - 8.6.1.6.

**Is there a fix for CVE-2026-13772?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-13772 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-13772?** Check whether you run IBM Websphere Extreme Scale at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is classified as Unsafe Reflection (CWE-470) within the Object Query Language (OQL) engine of IBM WebSphere Extreme Scale. The engine uses Class.forName() to resolve attacker-supplied class names and invokes their constructors without an allow-list at three specific sinks: SELECT NEW statements, enum literals, and reflection-based comparators. An authenticated remote attacker can achieve arbitrary code execution on the WebSphere JVM by influencing application-built OQL query strings. Additionally, a variant involving SELECT DISTINCT can bypass JEP-290 serialization filters across grid node boundaries. IBM recommends mitigating this by using query parameters instead of string concatenation and implementing strict allow-lists for class names.

## Affected products

- IBM WebSphere Extreme Scale 8.6.1.0 - 8.6.1.6

## Timeline

- 2026-06-30: disclosed: Initial publication of the advisory by IBM and NVD.
- 2026-06-30: advisory

## References

- [https://www.ibm.com/support/pages/node/7278593](https://www.ibm.com/support/pages/node/7278593)

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