CVE-2026-116100VulnerabilityPublished 26 Oct 2026

CVE-2026-116100: gougucms · Cross Site Scripting

Affects gougucmsSource CVE Database V5

Not known to be exploited · CVSS 4.8 Medium.

Data as of 26 Oct 2026, 00:58 UTC

CVSS 4.0 base score

4.8Medium

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

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: High
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

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

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, 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: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: High: The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system 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 to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
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

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 2026-10-25.

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 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

Affected software

Product	Affected	Fixed in
gougucms	Affected =4.08.0 =4.08.1 =4.08.2 =4.08.3 =4.08.4 =4.08.5 =4.08.6 =4.08.7 =4.08.8 =4.08.9 =4.08.10 =4.08.11 =4.08.12 =4.08.13 =4.08.14 =4.08.15 =4.08.16 =4.08.17 =4.08.18	Fixed in–
GitHubyuhuixiaowu/gougucms`pkg:github/yuhuixiaowu/gougucms`Other threats	Affected =4.08.0 =4.08.1 =4.08.2 =4.08.3 =4.08.4 =4.08.5 =4.08.6 =4.08.7 =4.08.8 =4.08.9 =4.08.10 =4.08.11 =4.08.12 =4.08.13 =4.08.14 =4.08.15 =4.08.16 =4.08.17 =4.08.18	Fixed in–

CPE configurations (1)

cpe:2.3:a:gougucms:gougucms:*:*:*:*:*:*:*:*

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AI-suggested

Users should apply strict input validation and output encoding on the Title parameter as a temporary mitigation. Monitoring for suspicious activity related to this vulnerability is advised. Await vendor advisory for official remediation.

Description

CVE-2026-116100 is a cross-site scripting (XSS) vulnerability in gougucms versions 4.08.0 through 4.08.18. It affects the Add function in the app/admin/controller/Level.php file, specifically the User Level Handler component. The vulnerability arises from improper handling of the Title argument, allowing remote attackers to inject malicious scripts. Public exploit code has been disclosed, but the vendor has not responded or issued a fix. The CVSS 4.0 score rates this as a medium severity vulnerability.

Impact

Successful exploitation can lead to execution of arbitrary scripts in the context of the affected application user, potentially enabling session hijacking, defacement, or other client-side attacks. The vulnerability requires user interaction and privileges (high privileges required, user interaction needed). There is no indication of direct system compromise or data breach from this vulnerability alone.

Summary

This vulnerability in gougucms up to version 4.08.18 allows remote attackers to perform cross-site scripting via manipulation of the Title parameter in the Add function of the User Level Handler component (app/admin/controller/Level.php). The flaw enables injection of malicious scripts that could be executed in the context of an authenticated user. The vulnerability has been publicly disclosed with exploit code available, but no vendor response or patch has been provided.

References

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