VulnerabilityPublished 31 Oct 2026

CVE-2026-107759: WPO365 | MICROSOFT 365 GRAPH MAILER (WordPress plugin) · Cross-site Scripting

Affects WPO365 | MICROSOFT 365 GRAPH MAILER (WordPress plugin)Source CVE Database V5

Not known to be exploited · CVSS 7.2 High · patch available : patch WPO365 | MICROSOFT 365 GRAPH MAILER (WordPress plugin) soon.

Data as of 31 Oct 2026, 08:10 UTC

CVSS 3.1 base score

7.2High

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (Wordfence)	CVSS 3.1	7.2

Patch: Available

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
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: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
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 31 Oct 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 30 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.
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

Affected software

Product	Affected	Fixed in
wpo365WPO365 \| MICROSOFT 365 GRAPH MAILER	Affected <=6.2	Fixed in–

AI-suggested

A patch is available for this vulnerability. Users should update the WPO365 | MICROSOFT 365 GRAPH MAILER plugin to a fixed version beyond 6.2. Since this is a cloud-hosted service plugin, the vendor manages remediation for the cloud environment; users should verify that OAuth authorization is completed after activation to reduce exposure. Check the vendor advisory for the latest patch and remediation instructions.

Description

The WPO365 | MICROSOFT 365 GRAPH MAILER WordPress plugin is affected by a stored Cross-Site Scripting (XSS) vulnerability in versions up to and including 6.2. This vulnerability arises from insufficient input sanitization and output escaping of the 'Subject' parameter used in mail-sending features. An unauthenticated attacker can inject malicious scripts that execute when users access the affected pages. The issue is present immediately after plugin activation if OAuth authorization is not completed, which is the default state. A fix is available for this vulnerability.

Impact

Successful exploitation allows unauthenticated attackers to inject and store malicious scripts that execute in the context of users visiting affected pages. This can lead to information disclosure and limited integrity impact. The CVSS v3.1 base score is 7.2 (high severity) with network attack vector, low attack complexity, no privileges or user interaction required, and scope changed. There is no availability impact. No known exploits in the wild have been reported.

Summary

CVE-2026-107759 describes a stored Cross-Site Scripting vulnerability (CWE-79) in the WPO365 | MICROSOFT 365 GRAPH MAILER WordPress plugin. The flaw exists in all versions up to and including 6.2 due to improper sanitization and escaping of the 'Subject' parameter used in mail sending via wp_mail/PHPMailer. Attackers can inject arbitrary web scripts without authentication by exploiting mail-sending features that forward user-controlled subjects, such as those submitted through Contact Form 7 forms, especially when the Graph Mailer is enabled but OAuth authorization is incomplete. This results in persistent script injection that executes when users view the injected content.

CWE-79Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 31 Oct 2026, 08:10 UTC

WeaknessesCWE-79

Technical details

References

Community reviews

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