CVE-2025-67850VulnerabilityPublished 4 Feb 2026Updated 26 Feb 2026

CVE-2025-67850: moodle · Cross-site Scripting

Affects moodleSource CVE Database V5

Not known to be exploited · CVSS 7.3 High · fixed in 5.1.1 : patch moodle soon.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

7.3High

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.1.1, 5.0.4, 4.5.8 +2

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
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: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
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 impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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 4 Feb 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

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
Packagistmoodle/moodle`pkg:composer/moodle/moodle`Other threats	Affected =4.1.0 =4.4.0 =4.5.0 =5.0.0 =5.1.0	Fixed in–
GitHubmoodle`pkg:github/moodle`Other threats	Affected >=4.1.0 <4.1.22 >=4.4.0 <4.4.12 >=4.5.0 <4.5.8 >=5.0.0 <5.0.4 >=5.1.0 <5.1.1	Fixed in 4.1.22 4.4.12 4.5.8 5.0.4 5.1.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

To mitigate CVE-2025-67850, organizations should prioritize updating Moodle to a patched version once available from the vendor. In the absence of immediate patches, administrators can implement strict input validation and output encoding on the formula editor's arithmetic expression fields to neutralize malicious scripts. Restricting the ability to input arithmetic expressions to trusted users or roles can reduce exposure. Additionally, enabling Content Security Policy (CSP) headers can help limit the impact of injected scripts by restricting the sources from which scripts can be loaded and executed. Regularly auditing user-generated content for suspicious scripts and educating users about the risks of interacting with untrusted content can further reduce exploitation chances. Monitoring logs for unusual activities related to the formula editor and user sessions can help detect attempted attacks. Finally, applying the principle of least privilege to user roles in Moodle minimizes the number of users who can inject potentially malicious content.

Description

A flaw was found in moodle. This vulnerability, known as Cross-Site Scripting (XSS), occurs due to insufficient checks on user-provided data in the formula editor's arithmetic expression fields. A remote attacker could inject malicious code into these fields. When other users view these expressions, the malicious code would execute in their web browsers, potentially compromising their data or leading to unauthorized actions.

Impact

The impact of CVE-2025-67850 is primarily on the confidentiality and integrity of user data within Moodle environments. Successful exploitation could allow attackers to hijack user sessions, steal sensitive information such as personal data or grades, and perform unauthorized actions on behalf of legitimate users. This could lead to data breaches, loss of trust, and potential compliance violations for organizations handling educational data. Since Moodle is widely used by educational institutions globally, the vulnerability could disrupt learning activities and compromise the privacy of students and staff. Although availability is not directly affected, the indirect consequences of data compromise and unauthorized actions could lead to operational disruptions. The requirement for attacker authentication and user interaction somewhat limits the attack scope but does not eliminate the risk, especially in environments with many users and collaborative content creation. The lack of known exploits in the wild currently provides a window for remediation before widespread attacks occur.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Feb 2026, 07:37 UTC

Technical details

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