CVE-2026-13181
RCE in Telerik UI for AJAX via forged upload metadata
Is CVE-2026-13181 being exploited?
Not confirmed. CVE-2026-13181 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.50% probability of exploitation in the next 30 days.
How severe is CVE-2026-13181?
CVE-2026-13181 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-13181?
Yes. A fix has been recorded for CVE-2026-13181. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-13181 affect?
CVE-2026-13181 affects Progress Telerik UI for ASP.NET AJAX < 2026.2.708, Web applications using Telerik AsyncUpload. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-13181?
Upgrade to v2026.2.708+ immediately; block suspicious uploads and review logs
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on servers using vulnerable Telerik AsyncUpload by supplying crafted upload metadata that forces unsafe type resolution.
Patch when possible
- affected>= 2010.1.309 and < 2026.2.708
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.