CVE-2026-21832Network attack vector

Authenticated HTML injection via indirect prompt injection

Published Aug 13, 2026 · Updated Aug 13, 2026

HTML injection in HCL AION 2.5.0 allows remote authenticated users to display injected markup through indirect prompt injection. HCL states that indirectly injected prompt content reaches rendered output as HTML, but it has not identified the affected interface or published the sanitization failure. A low-privileged network session is required; HCL reports displayed markup and has not described code execution or service interruption.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in HCL AION 2.5.0 allows remote authenticated users to display injected markup through indirect prompt injection. HCL states that indirectly injected prompt content reaches rendered output as HTML, but it has not identified the affected interface or published the sanitization failure. A low-privileged network session is required; HCL reports displayed markup and has not described code execution or service interruption.

The record

CVE
CVE-2026-21832
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
HCL Software
Product
HCL AION
Classifications
CWE-1427
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=v2.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HCL Software · HCL AIONversion=v2.5.0

Published CVSS scores

4.3HCL SoftwareCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1427Improper Neutralization of Input Used for LLM Prompting

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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