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HCL AION CVE-2026-21832

| EUVDEUVD-2026-57929 MEDIUM
Improper Neutralization of Input Used for LLM Prompting (CWE-1427)
2026-08-13 HCL GHSA-6h97-xh8x-92q9
4.3
CVSS 3.1 · Vendor: HCL
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Severity by source

Vendor (HCL) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
3.5 LOW

Impact reaches a second user only when they view the rendered output, making UI:R more accurate than the vendor's UI:N; PR:L and C:L are retained as the authentication barrier and limited HTML injection impact are well-supported.

3.1 AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (HCL).

CVSS VectorVendor: HCL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

1
Analysis Generated
Aug 13, 2026 - 15:21 vuln.today

DescriptionCVE.org

HCL AION is affected by a vulnerability where indirect prompt injection can lead to HTML injection in rendered output. Injected markup may be displayed to users, potentially resulting in unintended behavior or security impact under certain conditions.

AnalysisAI

Indirect prompt injection in HCL AION v2.5.0 enables authenticated network attackers to embed HTML markup into AI-generated rendered output, which may then be displayed to other platform users and trigger unintended browser behavior. Classified under CWE-1427 - a category specific to AI/LLM output sanitization failures - the vulnerability carries a vendor-assigned CVSS 4.3 Medium rating reflecting limited confidentiality impact and an authentication prerequisite. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated user account within HCL AION, consistent with the CVSS PR:L metric - no unauthenticated attack path is indicated. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.3 Medium score reflects a network-accessible (AV:N), low-complexity (AC:L) attack path that requires low-privilege authentication (PR:L) and yields only limited confidentiality impact (C:L) with no integrity or availability consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Consult the HCL Software vendor advisory KB0133084 at https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0133084 for patch guidance and any available fixed version. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-21832 vulnerability details – vuln.today

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