Quick answer
Direct answer
What is Langflow?
Langflow is the open source software identified in this vulnerability record as IBM Langflow OSS. If your developers, application teams, or internal users work with Langflow, the security question is not simply whether they can sign in. You also need confidence that each account can access only the information and operations it is supposed to use.
The supplied record does not describe Langflow's features or establish how your organization uses it. Start with your own deployment context: who operates the service, who receives accounts, what information is accessible through it, and which business processes depend on it. Those answers make a product inventory useful for security decisions rather than just a list of installed software.
This distinction matters for authorization vulnerabilities. Authentication establishes an identity, while authorization determines what that identity may do. A login requirement can reduce exposure without eliminating it. For you, the practical concern is whether an account with limited permissions could cross an intended access boundary. That is the central issue to investigate for CVE-2026-93678, not an assumed ability to attack anonymously.
CVE-2026-93678 at a glance
| Field | Detail |
|---|---|
| CVE ID | CVE-2026-93678 |
| Product | Langflow Langflow |
| Severity | HIGH |
| CVSS base score | 7.6 |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L |
| EPSS probability | 0.38 percent (percentile 30) |
| CISA KEV | Not listed at time of writing |
| Weakness | CWE-639 |
| Affected versions | Langflow from 1.0.0 before 1.12.3 |
| Published | October 7, 2026 |
What the flaw is
CVE-2026-93678 concerns improper authorization in Langflow versions 1.0.0 through 1.12.2. The supplied description identifies a potential disclosure of sensitive information to a remote authenticated attacker. It does not identify the vulnerable endpoint, the information involved, or the exact request that triggers the problem. Keep those limits visible when briefing stakeholders.
The assigned weakness is CWE-639, which describes an authorization bypass involving a key that a user can influence. Conceptually, this category concerns an application accepting a reference to a resource without adequately checking whether the requesting account has permission to access it. The classification supports that general explanation, but it does not establish which resource identifiers or access checks are involved here.
The supplied CVSS vector describes a network reachable attack requiring low privileges, low attack complexity, and no interaction from another user. Scope is unchanged. It assigns low confidentiality impact, high integrity impact, and low availability impact. These are scoring characteristics, not a published account of a working exploit or proof that every deployment will experience all three effects.
The disclosure focused description and the broader impact vector deserve separate attention. You can accurately say that sensitive information exposure is described and that the scoring also signals substantial integrity concern. You cannot infer a specific modification capability from that alone. Consult the IBM advisory at https://www.ibm.com/support/pages/node/7290694 for technical details and remediation instructions beyond the supplied record.
How an attack could happen
The following is a conceptual scenario for defensive planning, not a confirmed exploit sequence. It assumes an affected deployment, an attacker who can reach it, and an account with the privileges required by the vulnerability. It deliberately avoids assuming a particular endpoint, resource type, or authentication system.
- 1The attacker has authenticated access to the deployment. How that access was obtained is not established by the record. For your assessment, consider whether ordinary accounts are broadly available or limited to a small, controlled group.
- 2The attacker encounters an operation involving a resource reference. In the general CWE-639 pattern, the security question is whether the application checks the account's entitlement to the referenced resource rather than merely accepting a valid login.
- 3An inadequate authorization decision could allow information to cross an intended access boundary. The supplied description supports sensitive information exposure, but it does not identify the data, establish bulk access, or describe a particular victim.
- 4Your response would depend on what information was exposed and what other actions the advisory confirms. Do not automatically label the outcome as credential theft, administrative control, or service takeover without evidence supporting those additional conclusions.
Impact
For your business, an authorization failure can undermine the separation you expect between accounts and resources. Assess what sensitive information your particular deployment contains or exposes, who is entitled to it, and what disclosure would mean. Do not assume that every Langflow deployment stores the same data or presents an identical business risk.
The integrity component of the supplied vector is a reason to investigate potential unauthorized changes as well as reads. It is not sufficient evidence to claim that an attacker can edit any particular object. Similarly, the availability component does not establish a specific outage mechanism. Ask the vendor guidance to resolve these questions before designing a narrowly targeted validation test.
CVE-2026-93678 has HIGH severity and a CVSS score of 7.6. Its supplied EPSS value is 0.38 percent, and it is not in the CISA KEV catalog according to the supplied facts. EPSS is a probability estimate, not evidence of exploitation. Neither that estimate nor KEV absence should replace an assessment of your exposure and business consequences.
Who is affected
The affected range is Langflow from 1.0.0 before 1.12.3, also expressed in the description as 1.0.0 through 1.12.2. Compare that range with the version actually running. A deployment manifest, image label, or old inventory entry may not be enough to establish the current state without supporting runtime evidence.
The attacker must be remote and authenticated. This means account access and network reachability both matter to prioritization. An internally reachable instance is not automatically safe, and an internet reachable instance is not automatically exploitable without authentication. Document both conditions rather than reducing exposure to a single public or private label.
Version 1.12.3 is the upper boundary excluded from the stated affected range. The supplied facts do not explicitly provide a fixed version statement or upgrade procedure. Check the vendor advisory before presenting any version as the confirmed remediation, including for customized builds or distributions whose relationship to the affected range is unclear.
How to detect it
- Inventory Langflow deployments across the environments you manage, including development and temporary environments where relevant. Record the runtime version, owner, network entry points, authentication requirements, and business purpose. Treat an unknown version as an investigation task rather than marking the asset unaffected.
- Determine which accounts can reach each affected deployment and what permissions they should have. Pay particular attention to accounts whose expected access is narrow. Authorization review requires an intended access model against which observed behavior can be compared.
- Where your logs support it, examine resource access events alongside account identity and ownership or permission context. Look for successful access that conflicts with the documented authorization model. Do not assume that standard request logs contain enough information to make this determination.
- Review patterns such as repeated access denials followed by unexpected success, unusual breadth of resource access, or access outside an account's normal responsibilities. These are investigation leads for authorization problems, not published indicators specific to this CVE.
- Preserve relevant access records and configuration evidence before making disruptive changes. Record logging gaps explicitly. An absence of suspicious events is not strong assurance if the application never recorded the identity, target resource, or authorization outcome needed for analysis.
How to fix and reduce risk
Do this now
- Read the IBM advisory and establish the supported remediation path before changing production. Verify the applicable product, release, installation method, and any required follow up actions. Assign a named owner and a completion target based on your actual exposure.
- Reduce unnecessary network reachability while remediation is being arranged. Limit access to the people and systems that need the service. Treat this as exposure reduction, not a correction to the application's authorization logic.
- Review active accounts and remove access that is no longer justified. Tighten permissions where your deployment supports doing so. These steps can reduce attacker opportunities but cannot guarantee protection from a flaw that already operates with low privileges.
If you cannot patch yet
- Use compensating controls only with a clear statement of what they block. A network restriction may remove an external path while leaving authenticated internal access unchanged. Document the remaining access paths and the assumptions behind your temporary decision.
- Do not assume that stronger login controls fix improper authorization. They may help protect accounts, but the application must still enforce permissions after login. Validate any proposed endpoint restriction or feature disablement against vendor guidance rather than guessing which function is vulnerable.
Longer term hardening
- Apply the vendor confirmed remediation through your normal change process, then verify the running deployment rather than only the build configuration. Retain evidence of the installed state, completed validation, and any instances that could not be updated.
- Add permission boundary checks to authorized testing and release review. Where your application's access model requires separation, verify that one ordinary account cannot access another account's restricted resources. Keep these tests tied to documented permissions rather than relying only on whether login succeeds.
- If investigation identifies unauthorized access to sensitive information, follow your incident response process. Consider credential rotation only where exposure makes it relevant, and assess unauthorized changes where evidence supports that concern. Do not equate remediation with retrospective proof that nothing happened.
The CTEM view
| CTEM stage | What to do for this CVE |
|---|---|
| Scope | Define which Langflow deployments fall within your Continuous Threat Exposure Management program and why. Include the people who own the service, the teams that grant accounts, and the business owners of accessible information. Your scope should describe access boundaries and business importance, not merely the count of affected installations. |
| Discover | Connect version discovery with identity and network exposure discovery. A version match establishes potential applicability, but it does not show who can reach the deployment or what an ordinary account should access. Capture unknowns as explicit work items so incomplete inventory does not silently become a claim of safety. |
| Prioritize | Use CVSS 7.6 as a severity input and EPSS 0.38 percent as a separate likelihood signal. Then consider account availability, sensitive information, reachability, and business dependency. KEV absence does not justify ignoring an affected system whose authorization boundaries protect important information. |
| Validate | Confirm applicability and control effectiveness through vendor guidance and authorized testing. Use test accounts and synthetic resources where possible, with clear expected permission outcomes. Avoid accessing real users' information merely to demonstrate impact. Record what the test establishes and what remains unverified, including any missing technical details. |
| Mobilize | Give infrastructure, application, identity, and security teams distinct responsibilities. Track remediation, temporary restrictions, evidence review, and closure separately. Close the exposure when you have defensible evidence that the applicable remediation is deployed and relevant access boundaries hold, not simply when someone creates an upgrade ticket. |
Key takeaways
- Langflow versions 1.0.0 through 1.12.2 are identified as affected by an improper authorization issue involving remote authenticated access.
- CWE-639 points to an authorization problem involving a user influenced key, but the supplied facts do not reveal the vulnerable endpoint or resource.
- CVSS 7.6 indicates HIGH severity. EPSS 0.38 percent and absence from CISA KEV are context, not proof of safety or exploitation.
- Confirm the remediation in the IBM advisory. Do not treat the affected range boundary as a substitute for supported upgrade instructions.
- Your CTEM response should combine version evidence, account access, network reachability, permission validation, and a clearly owned remediation process.
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