CVE-2026-78003

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-22. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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 Mailgun for WordPress plugin for WordPress is vulnerable to Server-Side Request Forgery (SSRF) via path traversal in versions up to and including 2.2.0. This is due to insufficient input validation in the add_list() function, which accepts user-controlled array keys from $_POST['addresses'], passes them through sanitize_text_field(). This makes it possible for unauthenticated attackers to make authenticated POST requests to any Mailgun API endpoint using the WordPress site's API key, including creating inbound email-forwarding routes that can intercept password reset emails, leading to administrator account takeover.

CVSS v3
9.8
EG Score
9.8(high)
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
57%
KEV
Not listed

Published

August 22, 2026

Last Modified

August 25, 2026

References (9)

Vendor Advisories for CVE-2026-78003(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 53× in last 7d / 224× 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 224 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78003?
CVE-2026-78003 is a critical vulnerability published on August 22, 2026. The Mailgun for WordPress plugin for WordPress is vulnerable to Server-Side Request Forgery (SSRF) via path traversal in versions up to and including 2.2.0. This is due to insufficient input validation in the addlist() function, which accepts user-controlled array keys from $POST['addresses'],…
When was CVE-2026-78003 disclosed?
CVE-2026-78003 was first published in the National Vulnerability Database on August 22, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78003 actively exploited?
CVE-2026-78003 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 42.7% of all scored CVEs.
What is the CVSS score of CVE-2026-78003?
CVE-2026-78003 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-78003?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78003, 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.

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