CVE-2026-16268

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: Elevated riskExposed: 0

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

The Newsletters WordPress plugin before 4.16 does not authenticate or validate a bounce-processing request before fetching a user-supplied URL on the server side, allowing unauthenticated attackers to make the site issue requests to arbitrary internal or external hosts.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
53(Track)
EG Risk 53/100SSVC: 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
Severity82% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 6, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Newsletters < 4.16 – Unauthenticated Server-Side Request Forgery via SNS Bounce Handler | CVE 2026-16268 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/65612dd4-83d8-40c5-8e12-862e9b5f940b/

Vendor Advisories for CVE-2026-16268(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 20× in last 7d / 102× 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 173 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-16268.yaml
    First seen Jan 1, 2026

    Newsletters < 4.16 - Unauthenticated SSRF via SNS Bounce Handler

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16268?
CVE-2026-16268 is a high vulnerability published on August 6, 2026. The Newsletters WordPress plugin before 4.16 does not authenticate or validate a bounce-processing request before fetching a user-supplied URL on the server side, allowing unauthenticated attackers to make the site issue requests to arbitrary internal or external hosts.
When was CVE-2026-16268 disclosed?
CVE-2026-16268 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16268 actively exploited?
CVE-2026-16268 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 62.5% of all scored CVEs.
What is the CVSS score of CVE-2026-16268?
CVE-2026-16268 has a CVSS v3.1 base score of 8.2 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16268?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16268, 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

Explore the affected products and dependency analysis for CVE-2026-16268

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