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CVE-2026-13183 Progress Software CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-22T14:17:13.807Z and has not been modified since then. This HIGH-severity vulnerability in Progress Telerik UI for AJAX RadAsyncUpload allows remote attackers to recover protected metadata values through measurable timing differences in upload metadata processing. Users of Progress Telerik UI for AJAX versions prior to v2026.2.708 should assess and mitigate this vulnerability to prevent potential remote attacks.

Vendor
Progress Software
Product
Telerik UI for ASP.NET AJAX
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-22
Original CVE updated
2026-08-06
Advisory published
2026-07-22
Advisory updated
2026-08-06

Who should care

Users of Progress Telerik UI for AJAX versions prior to v2026.2.708, operators, platform administrators, vulnerability management teams, and security teams should assess and mitigate this vulnerability to prevent potential remote attacks and data exposure.

Technical summary

CVE-2026-13183 is a HIGH-severity vulnerability in Progress Telerik UI for AJAX RadAsyncUpload. Upload metadata processing may leak cryptographic validity through measurable timing differences, enabling remote attackers to recover protected metadata values. The vulnerability has a CVSS score of 7.5. Affected users should assess and mitigate this vulnerability to prevent potential remote attacks.

Defensive priority

High priority due to potential remote exploitation and data exposure.

Recommended defensive actions

  • Inventory and assess Progress Telerik UI for AJAX versions prior to v2026.2.708
  • Apply vendor-provided patches or updates
  • Implement compensating controls to monitor and restrict access to RadAsyncUpload functionality
  • Consider additional security measures to protect sensitive metadata
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

Evidence is limited; primary official records indicate a HIGH-severity vulnerability in Progress Telerik UI for AJAX RadAsyncUpload. Further verification and monitoring are recommended. The CVE record was published on 2026-07-22T14:17:13.807Z and has not been modified since then. Official records suggest measurable timing differences in upload metadata processing may leak cryptographic validity, enabling remote attackers to recover protected metadata values.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13183 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13183

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-13183 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13183

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-rau-timing-oracle-CVE-2026-13183

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.