# CVE-2026-53693: MISP BSimVis stored XSS in tag rendering code

Source: https://junglewise.ai/threats/cve-2026-53693-misp-bsimvis-stored-xss-in-tag-rendering-code  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-10. Updated: 2026-06-10  
License: CC BY 4.0 with a link back

CVE-2026-53693 · Severity: info · CVSS 6.9 · Published 2026-06-10

MISP BSimVis is a visualization tool used for analyzing security threat data. A vulnerability in how the tool displays labels and metadata allows an attacker to inject malicious code into the system. If a user views a page containing this malicious data, the code could execute in their browser, potentially allowing the attacker to steal information or perform unauthorized actions on the user's behalf.

Vendors: [MISP Project](https://junglewise.ai/threats/vendors/misp-project).

## Quick answers

**Is CVE-2026-53693 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-53693 being exploited in the wild.

**How severe is CVE-2026-53693?** Informational severity, with a CVSS score of 6.9, published 10 June 2026.

**Which products and versions are affected?** MISP Project Bsimvis through v0.2.0.

**Is there a fix for CVE-2026-53693?** 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-2026-53693 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-53693?** Check whether you run MISP Project Bsimvis 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

A stored cross-site scripting (XSS) vulnerability exists in the tag rendering code of MISP BSimVis through version 0.2.0. The application fails to properly escape tag names, collection names, entity identifiers, and metadata before interpolating them into HTML, attributes, JavaScript event handlers, and CSS values. An attacker can store a crafted payload in these fields that executes arbitrary JavaScript in the context of a victim's browser session. The vulnerability has been addressed in a commit that introduces shared escaping helpers for various output contexts.

## Affected products

- MISP bsimvis through v0.2.0

## Timeline

- 2026-06-10: disclosed
- 2026-06-10: advisory

## References

- [https://github.com/MISP/bsimvis/commit/7bcd2c2e27647dccdfb71877e905fbb032124a63](https://github.com/MISP/bsimvis/commit/7bcd2c2e27647dccdfb71877e905fbb032124a63)