CVE-2026-75872

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7%, top 48% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.9Exploit: None knownExposed: 0

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

HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email.

CVSS v3
6.9
EG Score
6.9(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity69% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

August 18, 2026

Last Modified

September 1, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic🟡 PoC Available

CVE-2026-75872 · HTML Injection in MailerUp allows attacker-controlled HTML to be delivered in double opt-in verification emails | Vulnerabilities published by Secur0

https://secur0.com/en/cna/cve-list/cve-2026-75872-html-injection-in-mailerup-double-optin-verification-email
github_commit

commit da4aedc96219 (maalfer/mailerup)

Fix landed in maalfer/mailerup commit da4aedc96219 — awaiting tagged release

https://github.com/maalfer/mailerup/commit/da4aedc9621911df4ce0cc8f0b321dd6d10f40a5

Vendor Advisories for CVE-2026-75872(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 17× in last 7d / 80× 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.

  1. 2026-09-19 01:54 UTCEG score recompute
  2. 2026-09-19 01:54 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 02:05 UTCEG score recompute
  5. 2026-09-18 02:05 UTCGHSA enrichment
  6. 2026-09-17 02:16 UTCEG score recompute
  7. 2026-09-17 02:16 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-16 02:27 UTCEG score recompute
  11. 2026-09-16 02:27 UTCGHSA enrichment
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-15 02:34 UTCGHSA enrichment
  14. 2026-09-14 02:32 UTCEG score recompute
  15. 2026-09-14 02:32 UTCGHSA enrichment
  16. 2026-09-13 02:43 UTCEG score recompute
  17. 2026-09-13 02:43 UTCGHSA enrichment
  18. 2026-09-12 15:02 UTCEPSS rescore
  19. 2026-09-12 02:54 UTCEG score recompute
  20. 2026-09-12 02:54 UTCGHSA enrichment
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 03:05 UTCEG score recompute
  23. 2026-09-11 03:05 UTCGHSA enrichment
  24. 2026-09-10 09:35 UTCEPSS rescore
  25. 2026-09-10 03:15 UTCGHSA enrichment
Show 66 more
  1. 2026-09-09 03:26 UTCEG score recompute
  2. 2026-09-09 03:26 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 21:54 UTCEG score recompute
  5. 2026-09-07 21:54 UTCGHSA enrichment
  6. 2026-09-06 22:04 UTCEG score recompute
  7. 2026-09-06 22:04 UTCGHSA enrichment
  8. 2026-09-06 13:48 UTCEPSS rescore
  9. 2026-09-05 22:13 UTCEG score recompute
  10. 2026-09-05 22:13 UTCGHSA enrichment
  11. 2026-09-04 22:23 UTCEG score recompute
  12. 2026-09-04 22:23 UTCGHSA enrichment
  13. 2026-09-04 05:07 UTCEPSS rescore
  14. 2026-09-03 22:32 UTCGHSA enrichment
  15. 2026-09-02 21:58 UTCEG score recompute
  16. 2026-09-02 21:58 UTCGHSA enrichment
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-01 21:03 UTCGHSA enrichment
  19. 2026-09-01 15:08 UTCEG score recompute
  20. 2026-09-01 15:08 UTCGHSA enrichment
  21. 2026-09-01 13:54 UTCEPSS rescore
  22. 2026-09-01 04:40 UTCEPSS rescore
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-08-31 14:58 UTCEG score recompute
  25. 2026-08-31 14:58 UTCGHSA enrichment
  26. 2026-08-30 19:18 UTCEPSS rescore
  27. 2026-08-30 19:17 UTCEPSS rescore
  28. 2026-08-30 14:46 UTCEG score recompute
  29. 2026-08-30 14:46 UTCGHSA enrichment
  30. 2026-08-30 01:22 UTCEPSS rescore
  31. 2026-08-29 14:57 UTCEG score recompute
  32. 2026-08-29 14:57 UTCGHSA enrichment
  33. 2026-08-28 21:42 UTCEPSS rescore
  34. 2026-08-28 15:06 UTCGHSA enrichment
  35. 2026-08-27 14:58 UTCEG score recompute
  36. 2026-08-27 14:58 UTCGHSA enrichment
  37. 2026-08-27 14:25 UTCEPSS rescore
  38. 2026-08-26 15:08 UTCEG score recompute
  39. 2026-08-26 15:08 UTCGHSA enrichment
  40. 2026-08-26 14:47 UTCEPSS rescore
  41. 2026-08-25 15:17 UTCEG score recompute
  42. 2026-08-25 15:17 UTCGHSA enrichment
  43. 2026-08-25 13:49 UTCEPSS rescore
  44. 2026-08-24 15:28 UTCEG score recompute
  45. 2026-08-24 15:28 UTCGHSA enrichment
  46. 2026-08-24 14:18 UTCEPSS rescore
  47. 2026-08-23 15:39 UTCEG score recompute
  48. 2026-08-23 15:39 UTCGHSA enrichment
  49. 2026-08-23 00:19 UTCEPSS rescore
  50. 2026-08-22 15:50 UTCEG score recompute
  51. 2026-08-22 15:50 UTCGHSA enrichment
  52. 2026-08-21 23:49 UTCEPSS rescore
  53. 2026-08-21 16:01 UTCEG score recompute
  54. 2026-08-21 16:01 UTCGHSA enrichment
  55. 2026-08-20 22:56 UTCEPSS rescore
  56. 2026-08-20 16:12 UTCEG score recompute
  57. 2026-08-20 16:12 UTCGHSA enrichment
  58. 2026-08-19 17:04 UTCEPSS rescore
  59. 2026-08-19 16:23 UTCGHSA enrichment
  60. 2026-08-18 16:34 UTCEG score recompute
  61. 2026-08-18 16:34 UTCGHSA enrichment
  62. 2026-08-18 16:13 UTCEG score recompute
  63. 2026-08-18 16:13 UTCGHSA enrichment
  64. 2026-08-18 15:19 UTCEG score recompute
  65. 2026-08-18 14:22 UTCEG score recompute
  66. 2026-08-18 14:20 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-75872?
CVE-2026-75872 is a medium vulnerability published on August 18, 2026. HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of…
When was CVE-2026-75872 disclosed?
CVE-2026-75872 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75872 actively exploited?
CVE-2026-75872 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 47.9% of all scored CVEs.
What is the CVSS score of CVE-2026-75872?
CVE-2026-75872 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-75872?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75872, 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

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