Medium Access control

CVE-2025-15633 — HCL BigFix WebUI is affected by an improper authorization vulnerability

An improper authorization vulnerability in HCL BigFix WebUI allows an authenticated user without Master Operator privileges to access internal data (site names, versions, and configuration variables) and bypass privilege requirements via unprotected endpoints lacking adequate security headers.

Published May 9, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: HCL

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2
Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.23%

ahead of 12% of scored CVEs · Oct 14, 2026

Affects

HCL Software

BigFix WebUI and 21 more

CVSS base

6.5

Medium · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (HCL Software BigFix WebUI, Hcltech Bigfix Webui Api, Hcltech Bigfix Webui Application Administration…).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
HCL Software	BigFix WebUI	version all versions	Vulnerable	CVE Program (cve.org) e CISA ADP
Hcltech	Bigfix Webui Api	< 33	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Application Administration	< 40	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Cmep	< 22	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Common	< 101	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Content App	< 28	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Custom	< 50	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Data Sync	< 37	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Extensions	< 14	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Framework	< 35	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Insights	< 32	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Ivr	< 23	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Mdm	< 29	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Patch	< 54	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Patch Policies	< 51	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Permissions And Preferences	< 27	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Profile Management	< 33	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Query	< 45	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Reports	< 24	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Scm	< 20	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Software Distribution	< 54	Vulnerable	NIST National Vulnerability Database
Hcltech	Bigfix Webui Take Action	< 37	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
5.3	CVSS 4.0	Medium	—	—	psirt@hcl.com via NIST National Vulnerability Database
5.3	CVSS 4.0	Medium	—	—	HCL via CVE Program (cve.org) e CISA ADP
6.5	CVSS 3.1	Medium	2.8	3.6	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-863 · Incorrect Authorization

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.23%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Audit administrative actions and access to resources outside each user’s normal pattern.

web/proxy/WAF logsnetwork IDS/IPSauthentication logsapplication logs

Timeline

What happened to this CVE, newest first.

2026
Affected products added · hclsoftware/bigfix webui
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 6.5
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
May 9, 2026 · HCL

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

support.hcl-software.com/csm
Vendor Advisory, NIST National Vulnerability Database

Elsewhere on this site

HCL Software
every CVE for this vendor

Access control
same class

CWE-863
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2025-15634 HCL BigFix WebUI is affected by a missing authorization vulnerability May 9, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-15633 is "HCL BigFix WebUI is affected by an improper authorization vulnerability", rated Medium. It affects BigFix WebUI (HCL Software); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.5 describes technical severity. EPSS 0.23% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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