Your RSA-2048 keys break in 2030. Find every one of them before attackers do.
🐍 PyPI

GHSA-r7c9-7pjq-hmm8

HIGH

GHSA-r7c9-7pjq-hmm8 is a high-severity (CVSS 7.2) Cross-site Scripting (XSS) vulnerability in postorius. O3 Security confirms whether GHSA-r7c9-7pjq-hmm8 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Postorius is vulnerable to XSS

Also known asCVE-2026-44742PYSEC-2026-2891
Published
May 7, 2026
Updated
Jul 13, 2026
Affected
1 pkg
Patched
None yet
Exploits
None indexed

Blast Radius

1 pkg affected
🐍postorius

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐍PyPIpostoriusall versionsNo fix

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for postorius. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Remediation status

    No patched version of postorius has shipped for GHSA-r7c9-7pjq-hmm8 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-r7c9-7pjq-hmm8 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-r7c9-7pjq-hmm8. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is GHSA-r7c9-7pjq-hmm8 in your dependencies?

O3 detects GHSA-r7c9-7pjq-hmm8 across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.