When you visit a page where you need to login, Plone 2.5-5.1rc1 sends you to the login form with a 'came_from' parameter set to the previous url. After you login, you get redirected to the page you tried to view before. An attacker might try to abuse this by letting you click on a specially crafted link. You would login, and get redirected to the site of the attacker, letting you think that you are still on the original Plone site. Or some javascript of the attacker could be executed. Most of these types of attacks are already blocked by Plone, using the isURLInPortal check to make sure we only redirect to a page on the same Plone site. But a few more ways of tricking Plone into accepting a malicious link were discovered, and fixed with this hotfix.
| Software | From | Fixed in |
|---|---|---|
| plone / plone | 3.3 | 3.3.x |
| plone / plone | 4.3.3 | 4.3.3.x |
| plone / plone | 4.3.11 | 4.3.11.x |
| plone / plone | 4.0.5 | 4.0.5.x |
| plone / plone | 4.3.6 | 4.3.6.x |
| plone / plone | 5.0.1 | 5.0.1.x |
| plone / plone | 4.2.3 | 4.2.3.x |
| plone / plone | 5.0.2 | 5.0.2.x |
| plone / plone | 5.0-rc2 | 5.0-rc2.x |
| plone / plone | 4.0.2 | 4.0.2.x |
| plone / plone | 5.0.5 | 5.0.5.x |
| plone / plone | 3.3.5 | 3.3.5.x |
| plone / plone | 4.3.5 | 4.3.5.x |
| plone / plone | 4.3.10 | 4.3.10.x |
| plone / plone | 5.0.3 | 5.0.3.x |
| plone / plone | 4.3 | 4.3.x |
| plone / plone | 4.2.2 | 4.2.2.x |
| plone / plone | 4.0.8 | 4.0.8.x |
| plone / plone | 5.0.6 | 5.0.6.x |
| plone / plone | 3.3.4 | 3.3.4.x |
| plone / plone | 4.0.7 | 4.0.7.x |
| plone / plone | 3.3.2 | 3.3.2.x |
| plone / plone | 4.2.7 | 4.2.7.x |
| plone / plone | 4.2.5 | 4.2.5.x |
| plone / plone | 5.0.4 | 5.0.4.x |
| plone / plone | 4.1.6 | 4.1.6.x |
| plone / plone | 4.0.4 | 4.0.4.x |
| plone / plone | 4.3.4 | 4.3.4.x |
| plone / plone | 4.0.9 | 4.0.9.x |
| plone / plone | 4.1.3 | 4.1.3.x |
| plone / plone | 4.1 | 4.1.x |
| plone / plone | 5.1-a1 | 5.1-a1.x |
| plone / plone | 5.1-a2 | 5.1-a2.x |
| plone / plone | 3.3.1 | 3.3.1.x |
| plone / plone | 4.1.4 | 4.1.4.x |
| plone / plone | 4.0.10 | 4.0.10.x |
| plone / plone | 5.0-rc1 | 5.0-rc1.x |
| plone / plone | 4.0 | 4.0.x |
| plone / plone | 4.3.7 | 4.3.7.x |
| plone / plone | 5.0 | 5.0.x |
| plone / plone | 4.3.8 | 4.3.8.x |
| plone / plone | 4.1.2 | 4.1.2.x |
| plone / plone | 4.1.5 | 4.1.5.x |
| plone / plone | 4.3.1 | 4.3.1.x |
| plone / plone | 4.2.6 | 4.2.6.x |
| plone / plone | 4.0.1 | 4.0.1.x |
| plone / plone | 4.1.1 | 4.1.1.x |
| plone / plone | 4.2.4 | 4.2.4.x |
| plone / plone | 3.3.6 | 3.3.6.x |
| plone / plone | 3.3.3 | 3.3.3.x |
| plone / plone | 4.3.9 | 4.3.9.x |
| plone / plone | 5.0-rc3 | 5.0-rc3.x |
| plone / plone | 4.0.3 | 4.0.3.x |
| plone / plone | 4.3.2 | 4.3.2.x |
| plone / plone | 2.5.5 | 2.5.5.x |
| plone / plone | 4.2 | 4.2.x |
| plone / plone | 4.2.1 | 4.2.1.x |
| plone / plone | 4.3.14 | 4.3.14.x |
| plone / plone | 4.3.12 | 4.3.12.x |
| plone / plone | 5.1-rc1 | 5.1-rc1.x |
| plone / plone | 5.1-b4 | 5.1-b4.x |
| plone / plone | 5.1-b3 | 5.1-b3.x |
| plone / plone | 5.1-b2 | 5.1-b2.x |
| plone / plone | 5.0.8 | 5.0.8.x |
| plone / plone | 5.0.7 | 5.0.7.x |
| plone / plone | 4.3.15 | 4.3.15.x |
| plone / plone | 5.0.9 | 5.0.9.x |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.
Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.