Accessibility audits can uncover many WCAG issues across a website or application. But not every issue creates the same level of barrier for users. The most urgent WCAG problems are those that prevent users with disabilities from accessing essential content, completing critical tasks, or operating core functionality.
A practical remediation strategy therefore should prioritize issues based on user impact, task criticality, frequency, affected users, and risk, rather than simply fixing issues in the order they appear in an audit report.
WCAG itself defines conformance through Success Criteria and Levels A, AA, and AAA; it does not prescribe a universal defect-severity system, such as high or low severity levels. Organizations can therefore use an impact-based severity model to determine remediation order while still working toward their required WCAG conformance level.
What is accessibility issue severity?
Accessibility issue severity indicates how significantly an accessibility issue affects a person's ability to perceive, understand, navigate, or interact with digital content or functionality.
Severity helps development, design, content, and accessibility teams answer a practical question: Which accessibility barriers need attention first?
For example, a missing form label and a slightly insufficient color contrast ratio are both accessibility problems, but their impact may be different. If an unlabelled checkout field prevents a screen reader user from completing a purchase, it deserves substantially higher remediation priority than a low-impact contrast issue on a secondary element.
A useful severity model can include:
Critical: Prevents access to essential content or functionality.
High: Creates a substantial barrier to completing important tasks.
Medium: Causes significant difficulty but a workaround may exist.
Low: Creates inconvenience or reduces usability without blocking access.
This model should complement – not replace – WCAG conformance requirements.
Is WCAG Level A More Severe Than Level AA?
No. WCAG Level A is not inherently more severe than Level AA. Conformance level and issue severity serve two different purposes: WCAG defines which accessibility requirements must be met while severity helps organizations determine which barriers demand attention first.
Level A Success Criterion represents a minimum conformance requirement, while Level AA adds additional requirements that organizations must meet to achieve AA conformance. However, the WCAG level assigned to a Success Criterion does not indicate how severely a failure affects users.
For example, a Level AA failure that prevents a screen reader user from completing checkout could create a far greater barrier than a Level A issue affecting a non-critical piece of content. In this situation, the Level AA issue may deserve immediate remediation because of its impact – even though it belongs to a higher conformance level.
Therefore, accessibility teams should avoid using Level A, AA, or AAA as a substitute for severity ratings. Instead, evaluate each issue based on factors such as:
User impact: How significantly does the issue affect people with disabilities?
Task criticality: Does it prevent users from completing an essential task?
Reach: How many pages, users, or workflows are affected?
Disability impact: Which groups of users are affected?
Workaround: Can users complete the task independently through another accessible method?
Business and compliance risk: Could the issue affect a critical service, legal obligation, or customer journey?
In short, WCAG tells an organization what needs to be accessible, and severity determines what needs to be fixed first. A strong remediation strategy considers both rather than assuming that every Level A issue is automatically more urgent than every Level AA issue.
A Practical WCAG Issue Severity Framework
A consistent severity framework makes remediation decisions easier and more defensible.
| Severity | Typical impact | Example WCAG problems | Recommended action | Recommended priority |
|---|---|---|---|---|
| Critical | Blocks access or prevent completion of an essential task | Keyboard trap, inaccessible authentication, form fields that cannot be completed with assistive technology | Fix immediately | P0 - Immediate |
| High | Seriously interferes with important functionality | Missing accessible names for key controls, inaccessible menus, major keyboard navigation problems | Fix as a top priority | P1 - Urgent |
| Medium | Causes substantial difficulty but a workaround may exist | Poor focus visibility, problematic reflow, unclear error identification | Schedule promptly | P2 - High |
| Low | Creates inconvenience or minor usability friction | Isolated low-impact labelling or presentation issues | Address during planned improvements | P3 - Planned |
Availability of a workaround also influences priority. If users cannot complete a task though any alternative accessible method, the issue becomes more urgent. For example, if a keyboard user cannot complete checkout and there is no accessible alternative, that barrier should be treated as a higher priority. A workaround may reduce the immediate impact, but it does not eliminate the underlying accessibility issue.
Which WCAG problems should be fixed first?
1. Fix barriers that block essential functionality
Issues that completely prevent a user from accessing or operating important functionality should generally come first.
Examples include:
- A screen reader user being unable to submit a critical form.
- Login or authentication mechanisms that exclude users with disabilities.
- Essential controls without an accessible name or role.
- Navigation that cannot be completed without a mouse.
- Important functionality that cannot be operated with assistive technology.
These barriers can effectively make part of a website unusable.
Priority: Critical
2. Focus on problems affecting user journeys
Next, fix accessibility issues within journeys that directly support important user goals.
For an ecommerce website, these may include:
- Product search
- Product selection
- Add-to-cart functionality
- Checkout
- Payment
- Order confirmation
For a financial service, they might include:
- Account login
- Balance access
- Transaction management
- Payment initiation
- Document submission
An accessibility defect becomes more significant when it occurs repeatedly throughout a critical journey.
Priority: Critical to High
3. Mend keyboard accessibility problems
Keyboard accessibility is relevant to people who navigate without a mouse, including many people with motor disabilities and some people using screen readers or alternative input technologies.
Common high-impact problems include:
- Interactive elements cannot receive focus.
- Focus order is confusing or focus is trapped.
- Keyboard users cannot open or close menus.
- Custom controls do not respond to keyboard input.
These issues can prevent users from navigating or completing tasks even when the visual interface appears functional.
Priority: Critical to High
4. Fix screen reader and programmatic interaction barriers
A visually complete interface may still be inaccessible if its structure and functionality cannot be interpreted programmatically.
High-priority examples include:
- Missing accessible names
- Incorrect roles or states
- Form fields without usable labels
- Dynamic content changes that are not communicated appropriately.
- Incorrect heading structure that makes navigation difficult.
- Dialogs that do not receive or return focus correctly.
- Error messages that are not exposed appropriately.
These problems can significantly affect blind and low-vision users, and people who rely on screen readers.
5. Correct inaccessible forms and error handling
Forms deserve special attention because they often sit directly on business-critical workflows.
Prioritize issues such as:
- Missing labels
- Instructions that are unavailable to assistive technology
- Errors that are only communicated through color
- Error messages that are not associated with the relevant field.
- Focus not moving appropriately after submission errors.
- Required fields not being identified clearly.
- Time-sensitive forms without an accessible way to extend the session.
If users cannot understand what went wrong or how to correct it, they may not be able to complete the transaction.
Priority: High
6. Fix barriers in frequently used components
A defect appearing once on a secondary page is different from the same defect appearing across a site’s global navigation, header, footer, modal, or design system.
Prioritize reusable components such as:
- Navigation menus
- Search interfaces
- Buttons
- Forms
- Modals
- Carousels
- Tabs
- Accordions
- Filters
- Shopping carts
Priority: High, especially when the affected component is reused extensively.
7. Address issues affecting multiple disability groups
Some accessibility barriers have a broader impact than others.
For example: An inaccessible interactive component may affect people using screen readers, keyboard navigation, switch devices, voice control, and other assistive technologies.
When one remediation can remove a barrier for multiple groups, it can provide significant accessibility value.
Priority: High to medium, depending on the affected functionality.
8. Mend content and visual barriers significantly affect comprehension
Not every accessibility issue prevents interaction. Some make content difficult or impossible to perceive or understand.
Examples include:
- Insufficient text contrast
- Missing alternative text for informative images
- Poor heading structure
- Videos without captions
- Instructions communicated only through color
- Content that becomes unusable at increased zoom
- Text or functionality that is obscured during reflow
The priority should depend on the content’s importance. A contrast problem on a primary call-to-action can be more consequential than the same problem on a decorative element.
Priority: High to medium
9. Remediate lower-impact consistency and usability issues
After critical barriers are addressed, teams can work through issues that affect usability without preventing access.
Examples may include:
- Less descriptive link text in secondary content.
- Minor heading hierarchy inconsistencies.
- Non-critical focus styling improvements.
- Isolated presentation problems.
- Minor content accessibility improvements.
These should not be ignored; lower severity means lower remediation priority. However, every issue matters.
Priority: Medium to low
Prioritize the barriers that matter most
Accessibility remediation is not about working through an audit report from top to bottom. The goal is to remove the barriers that have the greatest impact on users and critical business functions first.
One should prioritize issues based on severity, user impact, task criticality, reach, affected disability groups, and business risk rather than relying solely on WCAG conformance levels or the order in which issues appear in a report. Once critical and high-impact barriers are resolved, teams can systematically address lower-priority issues and validate fixes to prevent regression.
For a real-world example, read this gourment ecommerce store accessibility case study how they prioritized WCAG issues and addressed them.
We deliver accessibility audit and create prioritized remediation roadmap. To create a structured accessibility approach and apply the right remediation strategies, we can be your one-stop solution. Write accessibility requirements to hello@skynettechnologies.com or request a free quote.
