VulnerabilityPublished 21 Jul 2025Updated 22 Jul 2025

CVE-2025-51397: livehelperchat · A Stored Cross-site Scripting (XSS)

Affects livehelperchatSource CVE Database V5

Public exploit available (Exploit-DB) · CVSS 5.4 Medium : upgrade to 4.60 as a priority.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

5.4Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.9% chance of exploitation in 30 days – higher than 62% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.60

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 21 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
1 Exploit-DB entry, 1 day after disclosure
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

CVE ID reserved
by MITRE Corporation
16 Jun 2025, 35 days before disclosure
CVE published
on cve.org
21 Jul 2025, t = 0
In Threat Radar
record ingested
21 Jul 202519:01 UTC, the same day as disclosure
First Exploit-DB entry (opens in a new tab)
LiveHelperChat 4.61 - Stored Cross Site Scripting (XSS) via Operator Surname
22 Jul 2025, 1 day after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade livehelperchat/livehelperchat to 4.60.

Affected software

Product	Affected	Fixed in
GitHublivehelperchat/livehelperchat`pkg:github/livehelperchat/livehelperchat`Other threats	Affected <4.60	Fixed in 4.60

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

To mitigate this vulnerability, organizations should immediately audit their Live Helper Chat deployments and restrict access to the Facebook Chat module to trusted users only. Input validation and output encoding must be enforced rigorously on the 'Surname' parameter and any other user-supplied data fields to prevent injection of malicious scripts. If you cannot patch yet, applying web application firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting the Recipient Lists can reduce risk. Additionally, organizations should implement strict Content Security Policies (CSP) to limit the execution of unauthorized scripts in browsers. Regular user training to recognize phishing or social engineering attempts that might trigger the malicious payload is also recommended.

Description

A stored cross-site scripting (XSS) vulnerability in the Facebook Chat module of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Surname parameter under the Recipient' Lists.

Impact

For European organizations using Live Helper Chat, especially those integrating the Facebook Chat module for customer support or internal communications, this vulnerability could lead to unauthorized disclosure of sensitive information and manipulation of user sessions. Attackers exploiting this flaw could execute arbitrary scripts in the context of the victim’s browser, potentially stealing authentication tokens or performing actions with the victim’s privileges. This could compromise confidentiality and integrity of communications and user data. Given the medium severity and requirement for some privileges and user interaction, the impact is moderate but could escalate if combined with other vulnerabilities or social engineering tactics. Organizations in sectors such as finance, healthcare, and government, which rely heavily on secure communications, may face reputational damage, regulatory penalties under GDPR for data breaches, and operational disruptions if attackers leverage this vulnerability to gain further footholds or exfiltrate data.

CWE-779Logging of Excessive Data (opens in a new tab)
Base weaknessLikelihood of exploit: Low
The product logs too much information, making log files hard to process and possibly hindering recovery efforts or forensic analysis after an attack.
Architecture and Design
Suppress large numbers of duplicate log messages and replace them with periodic summaries. For example, syslog may include an entry that states "last message repeated X times" when recording repeated events.
Architecture and Design
Support a maximum size for the log file that can be controlled by the administrator. If the maximum size is reached, the admin should be notified. Also, consider reducing functionality of the product.
Implementation
Adjust configurations appropriately when the product is transitioned from a debug state to production.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

Timeline

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Jul 2025, 01:27 UTC

Public exploits and detection1 Exploit-DB entry

WeaknessesCWE-779

Technical details

References

Community reviews

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