Quick answers
- Is CVE-2026-33520 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-33520 being exploited in the wild.
- How severe is CVE-2026-33520?
- Medium severity, with a CVSS score of 6.1, published 26 October 2026.
- Which products and versions are affected?
- Esri Portal For Arcgis 12.1 and prior.
- Is there a fix for CVE-2026-33520?
- Yes: fixed in 11.5 (patch available for GA and Extended support versions). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-33520 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-33520?
- Check whether you run Esri Portal For Arcgis 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.
How to fix
- Fixed in: 11.5 (patch available for GA and Extended support versions)
Technical details
A reflected XSS vulnerability exists in Portal for ArcGIS versions 12.1 and prior, where unsanitized user input is reflected back in the HTTP response without proper encoding. The attack requires social engineering (victim clicks a crafted link) but no authentication; exploitation results in arbitrary JavaScript execution in the victim's browser context with access to their session, cookies, and data. A patch is available for versions in General Availability and Extended support status, including version 11.5; older versions are out of support.
Affected products
- Esri Portal for ArcGIS 12.1 and prior
Timeline
- 2026-10-26: disclosed