CVE-2026-18436

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-07-31. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign//restore-revision/). The route in the vulnerable range was registered without a permissionCallback, allowing the restoreRevision() handler to run for unauthenticated requests and overwrite a campaign's content_html with any prior revision. This makes it possible for unauthenticated attackers to modify campaign content by restoring an arbitrary revision.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 12, 2026

References (3)

Vendor Advisories for CVE-2026-18436(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 16× in last 7d / 69× 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 118 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-18436?
CVE-2026-18436 is a medium vulnerability published on July 31, 2026. The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revisionid>). The route in the vulnerable range was registered without a…
When was CVE-2026-18436 disclosed?
CVE-2026-18436 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18436 actively exploited?
CVE-2026-18436 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 86.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18436?
CVE-2026-18436 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-18436?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18436, 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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