Joomla! CMS EUVD-2026-31874

Q: What is the CVSS score of EUVD-2026-31874?

EUVD-2026-31874 has a CVSS 4.0 base score of 6.9 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

| CVE-2026-30895 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-05-26 Joomla

GHSA-vvc8-5fmm-vp8p

XSS Joomla Cms Joomla Project

6.9

CVSS 4.0 · Vendor: Joomla

Severity by source

Vendor (Joomla) PRIMARY

6.9 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (Joomla) · only source for this CVE.

CVSS VectorVendor: Joomla

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Jun 08, 2026 - 11:47 vuln.today

CVSS changed

May 26, 2026 - 17:22 NVD

6.9 (MEDIUM)

CVE Published

May 26, 2026 - 16:43 nvd

UNKNOWN (no severity yet)

DescriptionCVE.org

Lack of output escaping leads to a XSS vector in the readmore links for com_content.

AnalysisAI

Reflected or stored cross-site scripting in Joomla! CMS com_content component allows a high-privileged attacker to inject unescaped output into readmore links, executing arbitrary JavaScript in a victim's browser upon interaction. Affected releases span Joomla! CMS 4.0.0-5.4.5 and 6.0.0-6.1.0. No public exploit code has been identified and CISA KEV does not list this vulnerability, but a vendor security advisory has been published at the Joomla Security Centre.

Technical ContextAI

com_content is Joomla!'s core article and content management component, responsible for rendering article previews and their associated 'Read More' navigation links. CWE-79 (Improper Neutralization of Input During Web Page Generation) identifies the root cause: user-supplied or database-stored data used to construct readmore link attributes or anchor text is rendered into HTML without proper output escaping, allowing injection of script payloads. The affected CPE is cpe:2.3:a:joomla!_project:joomla!_cms:*:*:*:*:*:*:*:*, covering the CMS product line across both the 4.x/5.x and 6.x major branches. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:P) confirms the vulnerability is reachable over the network but requires a high-privileged account to introduce the payload and passive user interaction to trigger execution.

RemediationAI

Apply the vendor-released patch as documented in the Joomla Security Centre advisory at https://developer.joomla.org/security-centre/1036-20260504-core-xss-in-readmore-links. The advisory was published 2026-05-04; an exact patched release version should be confirmed directly from that advisory, as the available intelligence data identifies the upper boundary of affected versions (5.4.5 and 6.1.0) but does not explicitly state the first fixed release version. As a compensating control while patching is scheduled, restrict the ability to create or edit article readmore link fields to the minimum required set of privileged accounts and audit recent readmore link content for unexpected script tags or javascript: URI schemes. Restricting content editor roles reduces the pool of accounts that could introduce a payload; the trade-off is reduced content management agility. The NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-30895 may provide additional patch confirmation.