CVE-2026-13423

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

The Streamit WordPress theme through 4.5.0 does not perform any authorization or nonce verification on one of its unauthenticated AJAX routes, which invokes an attacker-supplied PHP function with an attacker-supplied argument array, allowing unauthenticated attackers to call arbitrary functions (for example to create an administrator account), leading to privilege escalation and remote code execution.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 29, 2026

Last Modified

July 30, 2026

Advisory Details (1)

Auto-updated Aug 27, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Streamit <= 4.5.0 – Unauthenticated Remote Code Execution via Arbitrary Function Call | CVE 2026-13423 | Theme Vulnerabilities

https://wpscan.com/vulnerability/f85c5da1-412f-4079-8c44-708bc78c2b9b/

Vendor Advisories for CVE-2026-13423(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 39× in last 7d / 213× 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 236 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-13423?
CVE-2026-13423 is a critical vulnerability published on July 29, 2026. The Streamit WordPress theme through 4.5.0 does not perform any authorization or nonce verification on one of its unauthenticated AJAX routes, which invokes an attacker-supplied PHP function with an attacker-supplied argument array, allowing unauthenticated attackers to call arbitrary functions…
When was CVE-2026-13423 disclosed?
CVE-2026-13423 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13423 actively exploited?
CVE-2026-13423 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.1% of all scored CVEs.
What is the CVSS score of CVE-2026-13423?
CVE-2026-13423 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-13423?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13423, 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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