CVE-2026-44742

HIGHNVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2026-05-07. NVD baseline CVSS 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.2Exploit: None knownExposed: 0

A fix is available — apply it.

Postorius through 1.3.13 does not escape HTML in the message subject when rendering it in the Held messages pop-up, as exploited in the wild in May 2026.

CVSS v3
7.2
EG Score
7.2(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: 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
Severity72% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

May 7, 2026

Last Modified

May 26, 2026

Advisory Details (3)

Auto-updated May 7, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

oss-security - XSS in Postorius (Mailman 3) 1.3.13 and earlier

https://www.openwall.com/lists/oss-security/2026/05/07/3
generic

Fixing held_messages.js (!972) · Merge requests · GNU Mailman / Postorius · GitLab

https://gitlab.com/mailman/postorius/-/merge_requests/972
generic

Merge branch 'xss-held-messages' into 'master' (c4706abd) · Commits · GNU Mailman / Postorius · GitLab

https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-django-postorius (1.3.13-1ubuntu1.1~26.04.1) @ resolute2026-08-23ubuntu
pippostorius—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
postorius1.3.4-2, 1.3.4-2+deb11u11.3.4-2+deb11u2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
postorius1.3.8-31.3.8-3+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
postorius1.3.13-11.3.13-1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
postorius1.3.13-1, 1.3.13-2——
PyPI(1)
PackageVulnerable rangeFixed inDependents
postorius1.0.0 ... 1.3.9 (37 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 30× 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 243 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-44742?
CVE-2026-44742 is a high vulnerability published on May 7, 2026. Postorius through 1.3.13 does not escape HTML in the message subject when rendering it in the Held messages pop-up, as exploited in the wild in May 2026.
When was CVE-2026-44742 disclosed?
CVE-2026-44742 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on May 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44742 actively exploited?
CVE-2026-44742 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 85.2% of all scored CVEs.
What is the CVSS score of CVE-2026-44742?
CVE-2026-44742 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-44742?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44742, 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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