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Oct8ne Chatbot CVE-2025-11952

MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2025-10-22 cve-coordination@incibe.es
5.3
CVSS 4.0 · Vendor: incibe
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Access Oct8ne chat/transcript function
  2. Delivery
    Inject malicious script into transcript
  3. Exploit
    Trigger summary email via /Records/SendSummaryMail
  4. Execution
    Victim opens transcript in browser
  5. Persist
    Stored JavaScript executes in victim context
  6. Impact
    Steal session cookies or act as victim

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires an attacker to inject a payload specifically during creation of a chat transcript that is subsequently distributed via the /Records/SendSummaryMail summary-email feature in Oct8ne Chatbot v2.3; the Records/SendSummaryMail transcript-to-email workflow must therefore be in use. Execution is limited by required user interaction (UI:P) - a victim (e.g., an agent or email recipient) must open or render the stored transcript/email in a browser for the script to fire - and impact is confined to the victim's browser session (session-cookie theft, actions on the user's behalf) with no direct impact on the server/application's own confidentiality, integrity, or availability (VC/VI/VA:N).

Impact

This is a medium-severity stored XSS (CVSS 4.0 base 5.3, CWE-79) with multiple signals pointing to limited real-world urgency rather than a top priority. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N) shows network reach with low complexity and no privileges required (PR:N), but exploitation depends on passive user interaction (UI:P) and the direct vulnerable-system impact metrics are all None - the harm lands only on the subsequent system (the victim's browser), reflected in SC:L/SI:L. EPSS is low at 0.19% (8th percentile), there is no CISA KEV listing and no public exploit identified at time of analysis, so there is no evidence of active exploitation or weaponization. Net assessment: a credible but modest-impact client-side flaw affecting a niche product; treat as a routine-patch item rather than an emergency. Note one tension to verify: PR:N implies the attacker can create the triggering transcript without authentication, yet transcript/summary-email generation (/Records/SendSummaryMail) often sits behind an operator or chat-session context - confirm with the vendor whether transcript creation is truly unauthenticated.

Exploit ScenarioDerived

An attacker injects a malicious JavaScript payload while creating a chat transcript, which is then delivered through the /Records/SendSummaryMail summary-email function. When an operator or recipient opens or renders the resulting transcript/email in their browser, the stored payload executes, allowing theft of session cookies or actions performed on the victim's behalf. No public exploit code is identified, and successful execution requires the victim to view the crafted content (UI:P).

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 08, 2026

Stored cross-site scripting in Oct8ne Chatbot v2.3 allows unauthenticated remote attackers to inject a JavaScript payload into a chat transcript that is subsequently distributed by the /Records/SendSummaryMail summary-email feature, causing the script to run in the browser of any recipient who opens or renders the poisoned transcript. Impact is limited to the victim's browser session - session-cookie theft or actions carried out on the victim's behalf - and requires the target to render the stored content (UI:P), with no effect on the server-side confidentiality, integrity, or availability of the application itself. EPSS is only 0.19% (8th percentile), no public exploit code has been identified at time of analysis, and the CVE is not in CISA KEV, so this is a medium-severity issue with limited real-world urgency rather than a top-priority patch item.

RemediationAI

No vendor-released patch identified at time of analysis - no fix version is stated in the supplied data, so the first action is to confirm status with Oct8ne and monitor the INCIBE advisory at https://www.incibe.es/en/incibe-cert/notices/aviso/stored-cross-site-scripting-xss-oct8ne-chatbot for an updated release. Until a patched version ships, apply compensating controls: if the transcript-email function is not operationally required, disable or block access to the /Records/SendSummaryMail endpoint (trade-off: loss of automated transcript delivery to customers/agents, which should be replaced by an in-app, sanitized view); enforce server-side output encoding or HTML sanitization of all transcript fields before they are rendered into the summary email or any web view (trade-off: requires code changes or a reverse-proxy/WAF response-rewrite rule, which can be bypassed if encoding is incomplete); and deploy a strict Content-Security-Policy on the application with script-src restricted to trusted origins to blunt script execution (trade-off: may break legitimate third-party chat widgets and inline scripts, requiring testing). Additional hardening includes restricting who can trigger transcript creation and delivery, and configuring mail clients to render HTML with script execution blocked. Note that these controls reduce exploitability but do not remove the underlying stored-XSS defect, so upgrading to a vendor-fixed version remains the only complete remediation.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation / cross-site scripting) in its stored variant: attacker-controlled content entered during transcript creation is persisted by the Oct8ne Chatbot v2.3 application and later re-rendered without adequate HTML/JavaScript encoding when the transcript summary is generated and emailed through the /Records/SendSummaryMail endpoint. Because the payload is stored server-side and delivered later to a different set of users (support agents, transcript recipients), the attack is asynchronous and does not require the attacker to be present at execution time. The affected component is identified by CPE cpe:2.3:a:oct8ne:chatbot:2.3, and the INCIBE advisory (cve-coordination@incibe.es coordination) is the sole reference. The vendor's CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N) characterizes this as a network-reachable, low-complexity, unauthenticated issue whose consequences are scored only against subsequent systems (SC:L/SI:L) - i.e., the victim's browser - consistent with the independent assessment (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N). Practical exploitation is constrained by rendering context: script execution depends on the transcript/email being opened in a browser context that does not sanitize or block the injected markup, and many mail clients strip active content, which materially reduces the exposed population.

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Severity by source

Vendor (incibe) PRIMARY 5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
vuln.today AI 6.1 MEDIUM

Payload injected without privileges (PR:N) over the network but executes only after a victim views the transcript (UI:R); stored XSS crosses into the browser (S:C) with low confidentiality/integrity impact and no availability effect.

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

Primary rating from Vendor (incibe).

CVSS VectorVendor: incibe

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
None
Vulnerable system: Availability
None
Subsequent system: Confidentiality
Low
Subsequent system: Integrity
Low
Subsequent system: Availability
None

DescriptionCVE.org

Stored Cross-site Scripting (XSS) in Oct8ne Chatbot v2.3. This vulnerability allows an attacker to execute JavaScript code in the victim's browser by injecting a malicious payload through the creation of a transcript that is sent by email. This vulnerability can be exploited to steal sensitive user data, such as session cookies, or to perform actions on behalf of the user, through /Records/SendSummaryMail.

Threat Intelligence Overview

EPSS Score
0.2%
Top 92% exploitable
Prevalence
Low
niche visual-commerce live-chat/chatbot product, limited enterprise footprint
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)CVE.org

cpe:2.3:a:oct8ne:chatbot:2.3:*:*:*:*:*:*:*

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