# CVE-2026-31803: Combodo iTop reflected XSS in tag admin

Source: https://junglewise.ai/threats/cve-2026-31803-combodo-itop-reflected-xss-in-tag-admin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-21. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-31803 · Severity: high · CVSS 8 · Published 2026-08-21

Combodo iTop is a web-based IT service management platform used by organizations to manage IT operations, change requests, and service incidents. A reflected cross-site scripting (XSS) vulnerability in the tag administration interface allows an authenticated attacker to inject malicious scripts that execute in a victim's browser, potentially leading to session hijacking, credential theft, or unauthorized modification of IT service data.

Technologies: [Combodo iTop](https://junglewise.ai/threats/technologies/itop). Vendors: [Combodo](https://junglewise.ai/threats/vendors/combodo).

## Quick answers

**Is CVE-2026-31803 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-31803 being exploited in the wild.

**How severe is CVE-2026-31803?** High severity, with a CVSS score of 8, published 21 August 2026.

**Which products and versions are affected?** Combodo iTop 3.2.2 and earlier.

**Is there a fix for CVE-2026-31803?** A patch was published on 2026-08-21: Fixed in versions 3.2.3 and 3.3.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-31803 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-31803?** Check whether you run Combodo iTop 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 reflected XSS vulnerability exists in pages/tagadmin.php prior to version 3.2.3, where user-controlled filter parameters are rendered into HTML comments without proper escaping. The vulnerability requires an authenticated user with low privileges to be tricked into clicking a malicious link. An attacker can craft a URL containing JavaScript payloads that execute in the context of the victim's session, allowing theft of session tokens, CSRF attacks, or lateral movement within the IT service management system. The fix (commit ab8e7bd) adds HTML escaping via utils::EscapeHtml() to sanitize the filter output.

## Affected products

- Combodo iTop 3.2.2 and earlier

## Timeline

- 2026-08-10: disclosed
- 2026-08-21: patched: Fixed in versions 3.2.3 and 3.3.0

## References

- [https://github.com/Combodo/iTop/commit/ab8e7bd15ed251ad4fbe8d4d1b17474b2d688fba](https://github.com/Combodo/iTop/commit/ab8e7bd15ed251ad4fbe8d4d1b17474b2d688fba)
- [https://github.com/Combodo/iTop/security/advisories/GHSA-m27p-8qgh-857g](https://github.com/Combodo/iTop/security/advisories/GHSA-m27p-8qgh-857g)

## Related threats

- [Combodo iTop missing authorization in LinkSetController](https://junglewise.ai/threats/cve-2026-108717-combodo-itop-3-1-0-through-3-3-0-contains-a-missing)
- [Combodo iTop PHP object injection in user preferences](https://junglewise.ai/threats/cve-2026-40877-combodo-itop-php-object-injection-in-user-preferences)
- [Combodo iTop remote code execution via unsafe eval](https://junglewise.ai/threats/cve-2026-39975-combodo-itop-remote-code-execution-via-unsafe-eval)
- [Combodo iTop reflected XSS in dashboard revert](https://junglewise.ai/threats/cve-2026-30864-combodo-itop-reflected-xss-in-dashboard-revert)
- [Combodo iTop .readonly file deletion by unauthenticated users](https://junglewise.ai/threats/cve-2026-34949-combodo-itop-readonly-file-deletion-by-unauthenticated-users)