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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

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

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
8.2HIGHmedium confidence
EG Risk
53
EG Risk 53/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 18× in last 7d / 89× 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 210 total refreshes for this CVE.

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

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 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 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-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?
No fix for CVE-2026-16268 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-16268 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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

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