CVE-2026-13156

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-07-20. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, ghsa
Trending — 5 sources updated this weekElevated
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 0

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

The MailerSend WordPress plugin before 1.0.8 does not perform a nonce check on its configuration-delete action (it verifies the manage_options capability but ignores the nonce), so an attacker can trick a logged-in administrator into visiting a crafted page that wipes the MailerSend WordPress plugin before 1.0.8's SMTP configuration and deactivates the MailerSend WordPress plugin before 1.0.8, breaking the site's email delivery.

CVSS v3
5.4
EG Score
5.4(high)
EPSS
0.8%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 20, 2026

Advisory Details (1)

Auto-updated Jul 20, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

MailerSend – Official SMTP Integration < 1.0.8 – Settings Deletion and Plugin Deactivation via CSRF | CVE 2026-13156 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/595e653d-0904-43cf-8e61-d684599de11b/

Vendor Advisories for CVE-2026-13156(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 258× in last 7d / 258× 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 258 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-20 15:36 UTCEG score recompute
  5. 2026-07-20 15:36 UTCGHSA enrichment
  6. 2026-07-20 15:31 UTCGHSA enrichment
  7. 2026-07-20 15:30 UTCGHSA enrichment
  8. 2026-07-20 15:23 UTCGHSA enrichment
  9. 2026-07-20 15:20 UTCGHSA enrichment
  10. 2026-07-20 15:19 UTCGHSA enrichment
  11. 2026-07-20 15:19 UTCGHSA enrichment
  12. 2026-07-20 15:19 UTCGHSA enrichment
  13. 2026-07-20 15:17 UTCGHSA enrichment
  14. 2026-07-20 15:17 UTCGHSA enrichment
  15. 2026-07-20 15:16 UTCGHSA enrichment
  16. 2026-07-20 15:15 UTCGHSA enrichment
  17. 2026-07-20 15:14 UTCGHSA enrichment
  18. 2026-07-20 15:11 UTCGHSA enrichment
  19. 2026-07-20 15:11 UTCGHSA enrichment
  20. 2026-07-20 15:08 UTCGHSA enrichment
  21. 2026-07-20 15:07 UTCGHSA enrichment
  22. 2026-07-20 15:07 UTCGHSA enrichment
  23. 2026-07-20 15:06 UTCGHSA enrichment
  24. 2026-07-20 15:00 UTCGHSA enrichment
  25. 2026-07-20 13:42 UTCEG score recompute▲ 5.40
Show 75 more
  1. 2026-07-20 13:42 UTCGHSA enrichment
  2. 2026-07-20 13:42 UTCMITRE cvelistV5CVSS v3 → 5.4 · severity → MEDIUM
  3. 2026-07-20 13:42 UTCGHSA enrichment
  4. 2026-07-20 13:40 UTCGHSA enrichment
  5. 2026-07-20 13:39 UTCGHSA enrichment
  6. 2026-07-20 13:38 UTCGHSA enrichment
  7. 2026-07-20 13:37 UTCGHSA enrichment
  8. 2026-07-20 13:36 UTCGHSA enrichment
  9. 2026-07-20 13:35 UTCGHSA enrichment
  10. 2026-07-20 13:34 UTCGHSA enrichment
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  17. 2026-07-20 13:28 UTCGHSA enrichment
  18. 2026-07-20 13:27 UTCGHSA enrichment
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  20. 2026-07-20 13:26 UTCGHSA enrichment
  21. 2026-07-20 13:25 UTCGHSA enrichment
  22. 2026-07-20 13:25 UTCGHSA enrichment
  23. 2026-07-20 13:23 UTCGHSA enrichment
  24. 2026-07-20 13:22 UTCGHSA enrichment
  25. 2026-07-20 13:21 UTCGHSA enrichment
  26. 2026-07-20 13:20 UTCGHSA enrichment
  27. 2026-07-20 13:20 UTCGHSA enrichment
  28. 2026-07-20 13:19 UTCGHSA enrichment
  29. 2026-07-20 13:18 UTCGHSA enrichment
  30. 2026-07-20 13:17 UTCGHSA enrichment
  31. 2026-07-20 13:17 UTCGHSA enrichment
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  35. 2026-07-20 13:14 UTCGHSA enrichment
  36. 2026-07-20 13:13 UTCGHSA enrichment
  37. 2026-07-20 13:12 UTCGHSA enrichment
  38. 2026-07-20 13:12 UTCGHSA enrichment
  39. 2026-07-20 13:11 UTCGHSA enrichment
  40. 2026-07-20 13:11 UTCGHSA enrichment
  41. 2026-07-20 13:11 UTCGHSA enrichment
  42. 2026-07-20 13:09 UTCGHSA enrichment
  43. 2026-07-20 13:08 UTCGHSA enrichment
  44. 2026-07-20 13:06 UTCGHSA enrichment
  45. 2026-07-20 13:05 UTCGHSA enrichment
  46. 2026-07-20 13:03 UTCGHSA enrichment
  47. 2026-07-20 13:01 UTCGHSA enrichment
  48. 2026-07-20 13:00 UTCGHSA enrichment
  49. 2026-07-20 13:00 UTCGHSA enrichment
  50. 2026-07-20 12:58 UTCGHSA enrichment
  51. 2026-07-20 12:58 UTCGHSA enrichment
  52. 2026-07-20 12:58 UTCGHSA enrichment
  53. 2026-07-20 12:56 UTCGHSA enrichment
  54. 2026-07-20 12:55 UTCGHSA enrichment
  55. 2026-07-20 12:54 UTCGHSA enrichment
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  60. 2026-07-20 12:50 UTCGHSA enrichment
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  66. 2026-07-20 12:46 UTCGHSA enrichment
  67. 2026-07-20 12:44 UTCGHSA enrichment
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  69. 2026-07-20 12:44 UTCGHSA enrichment
  70. 2026-07-20 12:40 UTCGHSA enrichment
  71. 2026-07-20 12:37 UTCGHSA enrichment
  72. 2026-07-20 12:35 UTCGHSA enrichment
  73. 2026-07-20 12:34 UTCGHSA enrichment
  74. 2026-07-20 12:33 UTCGHSA enrichment
  75. 2026-07-20 12:33 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13156?
CVE-2026-13156 is a medium vulnerability published on July 20, 2026. The MailerSend WordPress plugin before 1.0.8 does not perform a nonce check on its configuration-delete action (it verifies the manage_options capability but ignores the nonce), so an attacker can trick a logged-in administrator into visiting a crafted page that wipes the MailerSend WordPress…
When was CVE-2026-13156 disclosed?
CVE-2026-13156 was first published in the National Vulnerability Database on July 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13156 actively exploited?
CVE-2026-13156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-13156?
CVE-2026-13156 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-13156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13156, 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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