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GHSA-m8xh-cqc2-5q6f

CRITICAL

GHSA-m8xh-cqc2-5q6f is a critical-severity (CVSS 9.8) CWE-843 vulnerability in impresscms/impresscms. 3 public exploit references exist, so weaponization risk is real. O3 Security confirms whether GHSA-m8xh-cqc2-5q6f is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Type Confusion in ImpressCMS

Also known asCVE-2021-26600
Published
Mar 29, 2022
Updated
Nov 8, 2023
Affected
1 pkg
Patched
1 / 1
Exploits
3 known

Real-World Exposure

1 pkg affected
🐘impresscms/impresscms

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

Description

ImpressCMS before 1.4.3 has plugins/preloads/autologin.php type confusion with resultant Authentication Bypass (!= instead of !==).

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistimpresscms/impresscmsall versions1.4.3
Exploits & PoCs
3

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for impresscms/impresscms. 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. Fix

    Update impresscms/impresscms to 1.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-m8xh-cqc2-5q6f is resolved across your whole dependency graph.

  3. Workarounds

    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-m8xh-cqc2-5q6f 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-m8xh-cqc2-5q6f. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

ImpressCMS before 1.4.3 has plugins/preloads/autologin.php type confusion with resultant Authentication Bypass (!= instead of !==).
O3 Security · Impact-Aware SCA

Is GHSA-m8xh-cqc2-5q6f in your dependencies?

O3 detects GHSA-m8xh-cqc2-5q6f across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.