CVE-2026-13188

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2026-07-22. a secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In Progress® Telerik® UI for AJAX prior to v2026.2.708, DialogHandler request parameters may be tampered with, potentially altering dialog server-side behavior and enabling chained exploitation.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 22, 2026

Last Modified

August 6, 2026

Advisory Details (1)

Auto-updated Jul 22, 2026
No patch confirmed yet.
generic

Telerik Web Forms DialogHandler Parameters Tampering Vulnerability (CVE-2026-13188) - Telerik UI for ASP.NET AJAX

https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-dialoghandler-parameters-tampering-CVE-2026-13188

Vendor Advisories for CVE-2026-13188(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 64× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 138 total refreshes for this CVE.

  1. 2026-09-13 22:26 UTCEG score recompute
  2. 2026-09-13 22:26 UTCGHSA enrichment
  3. 2026-09-13 16:46 UTCEPSS rescore
  4. 2026-09-12 21:24 UTCEG score recompute
  5. 2026-09-12 21:24 UTCGHSA enrichment
  6. 2026-09-12 15:00 UTCEPSS rescore
  7. 2026-09-11 21:29 UTCEG score recompute
  8. 2026-09-11 21:29 UTCGHSA enrichment
  9. 2026-09-11 09:36 UTCEPSS rescore
  10. 2026-09-10 21:34 UTCEG score recompute
  11. 2026-09-10 21:34 UTCGHSA enrichment
  12. 2026-09-10 09:34 UTCEPSS rescore
  13. 2026-09-09 09:16 UTCEG score recompute
  14. 2026-09-09 09:16 UTCGHSA enrichment
  15. 2026-09-08 22:00 UTCEPSS rescore
  16. 2026-09-07 21:42 UTCEG score recompute
  17. 2026-09-07 21:41 UTCGHSA enrichment
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-06 13:47 UTCEPSS rescore
  20. 2026-09-05 19:34 UTCEG score recompute
  21. 2026-09-05 19:34 UTCGHSA enrichment
  22. 2026-09-04 13:54 UTCEG score recompute
  23. 2026-09-04 13:54 UTCGHSA enrichment
  24. 2026-09-04 05:06 UTCEPSS rescore
  25. 2026-09-02 14:11 UTCEPSS rescore
Show 75 more
  1. 2026-09-01 23:41 UTCEG score recompute
  2. 2026-09-01 23:41 UTCGHSA enrichment
  3. 2026-09-01 13:53 UTCEPSS rescore
  4. 2026-09-01 04:39 UTCEPSS rescore
  5. 2026-08-31 00:49 UTCEG score recompute
  6. 2026-08-31 00:49 UTCGHSA enrichment
  7. 2026-08-30 19:17 UTCEPSS rescore
  8. 2026-08-30 01:21 UTCEPSS rescore
  9. 2026-08-30 00:54 UTCEG score recompute
  10. 2026-08-30 00:54 UTCGHSA enrichment
  11. 2026-08-28 21:40 UTCEPSS rescore
  12. 2026-08-27 21:10 UTCEG score recompute
  13. 2026-08-27 21:10 UTCGHSA enrichment
  14. 2026-08-27 14:24 UTCEPSS rescore
  15. 2026-08-26 20:13 UTCEG score recompute
  16. 2026-08-26 20:13 UTCGHSA enrichment
  17. 2026-08-25 20:16 UTCEG score recompute
  18. 2026-08-25 20:15 UTCGHSA enrichment
  19. 2026-08-25 13:48 UTCEPSS rescore
  20. 2026-08-24 20:20 UTCEG score recompute
  21. 2026-08-24 20:20 UTCGHSA enrichment
  22. 2026-08-23 20:25 UTCEG score recompute
  23. 2026-08-23 20:25 UTCGHSA enrichment
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-22 20:30 UTCEG score recompute
  26. 2026-08-22 20:30 UTCGHSA enrichment
  27. 2026-08-21 23:48 UTCEPSS rescore
  28. 2026-08-21 20:35 UTCEG score recompute
  29. 2026-08-21 20:35 UTCGHSA enrichment
  30. 2026-08-20 22:55 UTCEPSS rescore
  31. 2026-08-20 20:40 UTCGHSA enrichment
  32. 2026-08-19 20:45 UTCEG score recompute
  33. 2026-08-19 20:45 UTCGHSA enrichment
  34. 2026-08-19 17:03 UTCEPSS rescore
  35. 2026-08-18 20:25 UTCEG score recompute
  36. 2026-08-18 20:25 UTCGHSA enrichment
  37. 2026-08-18 13:48 UTCEPSS rescore
  38. 2026-08-17 20:28 UTCEG score recompute
  39. 2026-08-17 20:28 UTCGHSA enrichment
  40. 2026-08-16 17:44 UTCEG score recompute
  41. 2026-08-16 17:44 UTCGHSA enrichment
  42. 2026-08-16 14:56 UTCEPSS rescore
  43. 2026-08-16 02:14 UTCEPSS rescore
  44. 2026-08-15 17:42 UTCEG score recompute
  45. 2026-08-15 17:42 UTCGHSA enrichment
  46. 2026-08-15 01:30 UTCEPSS rescore
  47. 2026-08-14 17:47 UTCEG score recompute
  48. 2026-08-14 17:47 UTCGHSA enrichment
  49. 2026-08-13 22:00 UTCEPSS rescore
  50. 2026-08-13 17:46 UTCGHSA enrichment
  51. 2026-08-12 17:52 UTCEG score recompute
  52. 2026-08-12 17:52 UTCGHSA enrichment
  53. 2026-08-12 13:50 UTCEPSS rescore
  54. 2026-08-11 17:57 UTCEG score recompute
  55. 2026-08-11 17:57 UTCGHSA enrichment
  56. 2026-08-10 23:59 UTCEPSS rescore
  57. 2026-08-10 18:02 UTCGHSA enrichment
  58. 2026-08-09 18:00 UTCEG score recompute
  59. 2026-08-09 18:00 UTCGHSA enrichment
  60. 2026-08-09 13:46 UTCEPSS rescore
  61. 2026-08-08 18:06 UTCEG score recompute
  62. 2026-08-08 18:06 UTCGHSA enrichment
  63. 2026-08-08 16:37 UTCEPSS rescore
  64. 2026-08-07 18:11 UTCEG score recompute
  65. 2026-08-07 18:11 UTCGHSA enrichment
  66. 2026-08-06 18:16 UTCEG score recompute
  67. 2026-08-06 18:16 UTCGHSA enrichment
  68. 2026-08-06 13:46 UTCEPSS rescore
  69. 2026-08-06 09:47 UTCEG score recompute
  70. 2026-08-06 09:47 UTCGHSA enrichment
  71. 2026-08-05 19:17 UTCEPSS rescore
  72. 2026-08-05 09:52 UTCEG score recompute
  73. 2026-08-05 09:51 UTCGHSA enrichment
  74. 2026-08-04 15:09 UTCEPSS rescore
  75. 2026-08-04 10:38 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-13188?
CVE-2026-13188 is a medium vulnerability published on July 22, 2026. In Progress® Telerik® UI for AJAX prior to v2026.2.708, DialogHandler request parameters may be tampered with, potentially altering dialog server-side behavior and enabling chained exploitation.
When was CVE-2026-13188 disclosed?
CVE-2026-13188 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13188 actively exploited?
CVE-2026-13188 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.9% of all scored CVEs.
What is the CVSS score of CVE-2026-13188?
CVE-2026-13188 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-13188?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13188, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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