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Vulnerabilities

Vulnerability · CVE-2026-44742

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.

Published May 7, 2026 · catalog updated Jun 17, 2026 · Postorius through 1.3.13 does

Patch now

CVE-2026-44742 is in the CISA known-exploited catalog. Confirm Postorius through 1.3.13 does against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Postorius through 1.3.13 does).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Medium6.1
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.33%
Remediation
Remediation guidance
Affected products
cpe postorius project/postorius · vendor postorius_project postorius

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe postorius project/postoriusversion unspecified
  • vendor postorius_project postoriusversion unspecified

How to fix CVE-2026-44742

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-44742 is in the CISA known-exploited catalog. Confirm Postorius through 1.3.13 does against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.33%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 7, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. May 7, 2026 · NIST NVD

    Detected

    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.

  3. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-44742

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-44742

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-44742

    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.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-44742

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.