VulnerabilityPublished 13 Nov 2026

CVE-2026-128040: OpenMage magento-lts · Cross-site Scripting

Affects OpenMage magento-ltsSource CVE Database V5

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Not known to be exploited · CVSS 8.4 High : upgrade to 20.18.2 soon.

Data as of 13 Nov 2026, 09:57 UTC

CVSS 4.0 base score

8.4High

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (VulnCheck)	CVSS 4.0	8.4
CNA (VulnCheck)	CVSS 3.1	6.1

Patch: Available – fixed in 20.18.2, 21.0.0-beta3

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

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

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: High: There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Vulnerable system integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the vulnerable system. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence 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.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 13 Nov 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 magento-lts to 20.18.2; magento-lts to 21.0.0-beta3; openmage/magento-lts to 21.0.0-beta3 or 20.18.2.

Affected software

Product	Affected	Fixed in
OpenMagemagento-lts	Affected <20.18.2	Fixed in 20.18.2
OpenMagemagento-lts	Affected >=21.0.0-beta1 <21.0.0-beta3	Fixed in 21.0.0-beta3
GitHubopenmage/magento-lts`pkg:github/openmage/magento-lts`Other threats	Affected <20.18.2 >=21.0.0-beta1 <21.0.0-beta3	Fixed in 20.18.2 21.0.0-beta3

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AI-suggested

Upgrade OpenMage magento-lts to version 20.18.2 or later, or to 21.0.0-beta3 or later, where this vulnerability is fixed. No other mitigation is indicated or recommended by the vendor advisory.

Description

OpenMage magento-lts versions before 20.18.2 and 21.0.0-beta3 contain a stored cross-site scripting (XSS) vulnerability. This flaw arises because certain admin page elements such as Dataflow profile link variables, tax rate titles, OAuth consumer names, and PayPal certificate filenames are rendered without proper escaping. An administrator with restricted access can inject malicious scripts that execute when another administrator views the affected page, potentially allowing privilege escalation through session hijacking or unauthorized actions.

Impact

An attacker with restricted administrator access can store malicious scripts that execute in the context of other administrators, including full administrators. This can lead to theft of form keys and unauthorized actions performed with elevated privileges, potentially compromising the integrity and security of the administrative interface.

Summary

CVE-2026-128040 is a stored cross-site scripting vulnerability in OpenMage magento-lts prior to versions 20.18.2 and 21.0.0-beta3. The vulnerability occurs because admin pages render specific variables and names without escaping, enabling an attacker with limited admin privileges to inject scripts. These scripts execute when other administrators access the page, allowing the attacker to read form keys and perform actions with the victim administrator's privileges. The issue affects versions >=0 and <20.18.2, and >=21.0.0-beta1 and <21.0.0-beta3. The vulnerability has a CVSS 4.0 score of 8.4, indicating high severity.

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What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Nov 2026, 09:57 UTC

Technical details

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