VulnerabilityPublished 30 Sep 2026Updated 2 Oct 2026

CVE-2026-93463: baserCMS · Cross-site Scripting (XSS)

Affects baserCMSSource CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium : upgrade to 5.4.1 or 5.3.1 when convenient.

Data as of 13 Nov 2026, 23:54 UTC

CVSS 3.0 base score

5.4Medium

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.4.1, 5.3.1

CVSS:3.0/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

Disclosed: evidence found.
CVE published 30 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 13 Nov 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 baserCMS to 5.4.1 or 5.3.1.

Affected software

Product	Affected	Fixed in
baserCMS User CommunitybaserCMS	Affected <5.4.1	Fixed in 5.4.1
baserCMS User CommunitybaserCMS	Affected <5.3.1	Fixed in 5.3.1

AI-suggested

If you cannot patch yet, users should exercise caution with untrusted input and consider implementing additional input validation or content security policies to mitigate XSS risks.

Description

CVE-2026-93463 is a cross-site scripting (XSS) vulnerability in baserCMS that allows arbitrary script execution in a user's browser due to a script validation bypass. The vulnerability affects baserCMS versions prior to 5.4.1 and 5.3.1. It has a medium severity rating with a CVSS score of 5.4.

Impact

Successful exploitation could allow an attacker to execute arbitrary scripts in the victim's browser, potentially leading to data disclosure or manipulation within the affected application context. The impact is limited to confidentiality and integrity with no reported availability impact. There are no known active exploits in the wild.

Summary

This vulnerability in baserCMS arises from insufficient script validation, enabling an attacker to inject and execute arbitrary scripts in the context of a user's browser session. The issue is classified as a cross-site scripting (XSS) vulnerability and affects baserCMS versions before 5.4.1 and 5.3.1. The CVSS 3.0 vector indicates network attack vector, low attack complexity, requiring low privileges and user interaction, with impact on confidentiality and integrity but not availability.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 7 Oct 2026, 21:06 UTC

Technical details

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