🛡️ CVE-2026-44742 — postorius

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-79 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Postorius is vulnerable to XSS 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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

CVE-2026-44742 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software and timeline

Affected software: postorius and unknown. Published on 7 May 2026 and last revised on 13 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

nvd.nist.gov (Advisory)
gitlab.com (Package)
gitlab.com (Web)
gitlab.com (Web)
gitlab.com (Web)
www.openwall.com (Web)

CVE-2026-44742 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2026-05-07
Updated 2026-08-12
Modified 2026-07-13

Affected Packages

Software From version Fixed in
postorius — —
unknown — —

Similar Threats

Site Security Check

Is postorius part of your stack?

CVE-2026-44742 is rated CVSS 8.0 High. BotEraser scans your installation against known CVE records and tells you whether this vulnerability applies to the versions you actually run.

Scan My Site Free →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

More CVE 2026 advisories

Part of CVE 2026 in the advisory index.