Don't Make It Easy for Attackers: 5 Common AppSec Gaps

Key Takeaways

1. Long intervals between security tests create opportunities for attackers as application changes introduce vulnerabilities that may go undetected until the next assessment.
2. Unvalidated vulnerability backlogs make prioritization harder by obscuring exploitable risks among theoretical findings, duplicates, and low-impact issues.
3. Authentication, authorization, and business logic vulnerabilities require deeper testing because predefined scans often miss weaknesses tied to application-specific workflows and permissions.
4. Remediation is incomplete without verification because closing a vulnerability ticket does not guarantee that the underlying exploit or related attack paths have been eliminated.
5. Adaptive, autonomous penetration testing helps teams close AppSec gaps by exploring complex attack paths, validating exploitability, and confirming fixes more frequently without proportionally increasing manual effort.

Attackers do not need every application security control to fail. They only need one exploitable path. While security teams can’t eliminate every vulnerability, they can make an attacker’s job harder by closing some important gaps in their AppSec programs.

It’s October, which means it’s Cybersecurity Awareness Month, and one of the themes this year is “Don’t Make It Easy for Them.” We’re putting an AppSec spin on the theme, and sharing some tips on making it more challenging for attackers to exploit vulnerabilities in your application portfolio. Considering the speed with which attackers can now find and exploit vulnerabilities, making their jobs harder is becoming critical, but it’s also not an easy task: Even mature AppSec programs can leave opportunities for attackers. Applications change between scheduled tests, vulnerability backlogs obscure exploitable risks, and critical workflows may go untested. Fixes can also leave attack paths open, while rigid testing methods may miss how attackers adapt and combine weaknesses.

Addressing these weaknesses requires better visibility into exploitable risk and a testing approach that keeps pace with application changes. Autonomous penetration testing, including platforms like XBOW, can help teams discover vulnerabilities, explore attack paths, and verify fixes more frequently.

Gap 1: Long intervals between tests

Penetration testing remains the gold standard for identifying true exploitable risk in applications, but increasing the frequency of or scaling that testing across an application portfolio is cost- and time-prohibitive for most teams. Meanwhile, applications rarely remain unchanged between penetration tests. New features, API endpoints, third-party integrations, and permission changes can introduce vulnerabilities long after the previous assessment. When testing happens only to a subset of applications quarterly or annually, these changes may go unexamined for months.

Security teams can reduce this exposure by leveraging autonomous offensive security testing to align testing frequency and scale with the pace of application change. High-change applications and business-critical workflows should receive more frequent assessments, with continuous validation where practical. Solutions like XBOW can support this approach by testing applications more frequently and validating exploitable vulnerabilities as the attack surface evolves.

Gap 2: Backlogs without validation

Security teams typically have more vulnerability findings than they can realistically investigate or fix. Scanners continuously surface potential weaknesses, but severity scores and automated classifications do not always reflect whether an issue is reachable, exploitable, or likely to cause meaningful damage.

Without validation, vulnerability backlogs can become crowded with theoretical risks, duplicate findings, and tickets lacking sufficient context. Critical vulnerabilities may sit alongside issues that pose little practical threat, making it harder for teams to determine where remediation efforts will have the greatest impact.

Prioritization should account for whether a vulnerability is reachable and exploitable, which assets it affects, and the potential business impact. Platforms like XBOW can provide reproducible evidence of exploitation, giving security teams stronger information for remediation decisions and reducing the time developers spend investigating uncertain findings.

Gap 3: Under-tested authentication, authorization, and business logic

Some of the most consequential application vulnerabilities are difficult to detect with standard scanning tools. Authentication and authorization flaws often depend on how users, roles, and permissions interact, while business logic vulnerabilities exploit legitimate application functionality in ways developers never intended.

For example, an application may properly authenticate users but fail to enforce permissions on a sensitive API endpoint. A user could then access another customer’s records or perform actions beyond their assigned privileges. These weaknesses may go undetected when testing relies on predefined checks or examines only unauthenticated portions of an application.

Testing authenticated workflows and different user roles can reveal weaknesses that unauthenticated scans miss. Security teams should pay particular attention to sensitive transactions and high-impact operations where improper permissions could expose data or functionality. Adaptive testing can explore these application-specific interactions and validate whether they create exploitable vulnerabilities.

Gap 4: Fixes closed without verification

Closing a remediation ticket does not guarantee that the underlying vulnerability has been eliminated. A fix may resolve the original finding while leaving another route to the same functionality exposed.

Without retesting, security teams have no reliable way to confirm whether remediation actually worked. A developer may correct an authorization flaw in one API endpoint, for example, while another endpoint continues to allow the same unauthorized access. The ticket is marked resolved, but the risk remains.

Retesting should be a standard part of the remediation process, with evidence confirming that the original exploit and related attack paths are no longer viable. Platforms like XBOW can help teams verify fixes more frequently without waiting for another scheduled manual assessment. This allows security teams to track remediation based on demonstrated risk reduction rather than ticket closure alone.

Gap 5: Rigid testing that misses adaptive attack paths

Attackers rarely stop after testing a single vulnerability. They explore application behavior, adjust their techniques based on the results, and look for ways to combine weaknesses into a usable attack path. An issue that appears low-risk in isolation may become more serious when chained with another vulnerability or misconfiguration.

Static and/or dynamic scanning and checklist-driven testing can miss these connections. Multi-step attacks often depend on application-specific behavior, user permissions, and environmental context that predefined tests may not account for. For example, an attacker might combine an information disclosure flaw with weak access controls to reach sensitive functionality that neither issue would expose on its own.

Combining structured testing with adaptive exploration helps security teams investigate how individual weaknesses interact. XBOW's autonomous offensive security testing can follow promising attack paths as new information emerges, including testing whether separate vulnerabilities can be combined to compromise an application.

How to close these gaps without overwhelming the team

Security teams should concentrate testing and remediation efforts on applications that change frequently or carry significant business risk. New releases, integrations, and permission changes can introduce vulnerabilities that warrant more frequent assessments. Testing should also cover authenticated workflows, access controls, and sensitive transactions that basic scanning may overlook.

Vulnerability validation should also guide remediation priorities. Confirming reachability and exploitability helps teams distinguish meaningful risks from theoretical findings, reducing unnecessary triage work. Once fixes are implemented, retesting should confirm that the original vulnerability and associated attack paths have been closed.

Human expertise remains essential for interpreting business impact, setting priorities, and investigating complex risks. Adaptive, autonomous testing can extend that expertise across more applications, helping teams validate findings and verify remediation without a proportional increase in manual effort.

Don’t make it easier for attackers

Review your current testing and remediation processes to identify which gaps leave the most exploitable risk unaddressed. Pay particular attention to applications with frequent changes, unresolved findings that lack validation, and vulnerabilities closed without retesting.

Use those findings to determine where testing frequency, coverage, or exploit validation needs improvement. If existing resources cannot support the required testing cadence, evaluate whether autonomous offensive security testing can help close that gap.

See how XBOW helps security teams identify and validate real, exploitable vulnerabilities across modern applications with autonomous AI pentesting.