CVE-2026-44742

HIGHNVD 7.27.2—

7.2

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(high)
EPSS: 1.5%
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(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
pip	postorius	—	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

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
postorius	1.0.0 ... 1.3.9 (37 versions)	—	—

Weakness Classification(1)

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

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 10× in last 7d / 15× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-21 22:43 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 13:53 UTCEG score recompute
2026-05-20 13:53 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch

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 1.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-44742

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CVE-2026-44742

📅 Published

🔄 Last Modified

📋 Advisory Details (3)