Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessObtain victim's emailed verification code
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DeliveryVictim verifies email change
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ExploitReplay code to users/set-password
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ExecutionReset victim password
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ImpactFull account takeover
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK
2 techniques across 2 tactics: Defense Evasion, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Exploitation requires that (1) the attacker obtains the victim's emailed verification code for an email-change operation, and (2) the victim actually completes the email-change verification via users/verify-email, which leaves the code valid; the attacker then replays that code to users/set-password. The decisive limiting factor is possession of the one-time code - the flaw is that Craft CMS 5.0.0-5.10.x fails to invalidate verification codes for active users, so the attack is not possible against patched 5.11.0+ and is impractical without access to the code. This constrains exploitation to attackers with email interception/access or control of the change flow, making it targeted rather than broadly remote despite the network attack vector. |
| Impact | This is a credible, above-average-priority issue but not a drop-everything emergency. The vendor-supplied CVSS 4.0 vector (8.7, AV:N/AC:L/PR:N/UI:N) frames it as a remote, unauthenticated, no-interaction attack with high confidentiality impact (VC:H), which maps to a network-exploitable authentication bypass (CWE-287). However, the description materially qualifies that framing: the attacker must OBTAIN the victim's emailed verification code AND the victim must independently verify an email change - so in practice there IS a precondition (code possession) and a form of victim-triggered interaction that the AC:L/UI:N metrics understate. This is a signal conflict worth flagging: CVSS indicates trivial remote exploitation, but the description implies the attacker needs out-of-band access to a one-time code and a specific user action, suggesting targeted rather than spray-and-pray exploitation. No EPSS score was provided in the input, the CVE is NOT on CISA KEV, and no public POC is referenced, so there is no active-exploitation or weaponization signal. Net: a real authentication/account-takeover flaw in a widely-used CMS that should be patched promptly (upgrade to 5.11.0), but current evidence points to conditional, targeted abuse rather than mass exploitation. |
| Exploit ScenarioDerived | An attacker who can intercept or otherwise obtain a victim's emailed email-change verification code (e.g., via email access, a leaked message, or an attacker-initiated change flow) waits until the victim completes the email verification, then replays that still-valid code against the users/set-password endpoint to reset the victim's password and seize the account. Because users/verify-email never invalidates the code for active users, the code remains reusable. No public exploit code is identified at time of analysis. |
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Alert meAnalysisAIv1 – Oct 19, 2026
Account takeover in Craft CMS 5.0.0 through 5.10.x: the users/verify-email action fails to invalidate a user's emailed verification code for active accounts, so a code that has already been used to confirm an email change can be replayed against users/set-password to reset the victim's password. According to the CVSS vector no authentication is required (PR:N), but practical exploitation is gated on obtaining the victim's one-time code - via email interception or control of the change flow - and on the victim actually completing the verify-email step, which is why the assessed vector carries AC:H/UI:R and the issue is considered targeted rather than broadly remote. No public exploit code or confirmed active exploitation was identified at time of analysis, and the behavior is corrected in Craft CMS 5.11.0.
RemediationAI
Vendor-released patch: upgrade to Craft CMS 5.11.0, which invalidates verification codes after use and closes the users/set-password replay path; follow the GHSA-xh42-494x-2xgv advisory (https://github.com/craftcms/cms/security/advisories/GHSA-xh42-494x-2xgv) for the upgrade steps and run any pending migrations after updating. If upgrading immediately is not possible, reduce exposure by disabling front-end email-address changes for active users (require an administrator to perform or approve email changes in the control panel and consider turning off public registration-driven email edits) - the trade-off is added administrative overhead and slower self-service for users; additionally consider forcing a password reset and session invalidation for accounts that recently completed an email change, monitoring logs for users/set-password submissions that follow a users/verify-email event from a different source address, and requiring two-factor authentication on privileged accounts to blunt the impact of a successful reset - at the cost of enrolment friction. Because exploitation hinges on possession of the emailed code, hardening mailbox security (transport encryption, anti-phishing, and prompt review of unexpected email-change notifications) is an effective compensating control, though it does not remove the underlying defect.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Craft CMS is a PHP content management system built on the Yii 2 framework, and its front-end user account flows are implemented as controller actions (users/verify-email, users/set-password) that rely on short-lived emailed tokens. The root cause is class CWE-287 (Improper Authentication): when an active user completes verification of an email-address change, the corresponding verification code is not consumed or invalidated server-side, leaving a still-valid token that the password-reset endpoint accepts as proof of identity. The CPE cpe:2.3:a:craftcms:cms:*:*:*:*:*:*:*:* with the vendor's stated range pins affected releases to 5.0.0 and later but before 5.11.0, i.e. the 5.x branch prior to the token-handling fix. Because the weakness is a state-management flaw in token lifecycle rather than a cryptographic break, the exposure is bounded by the difficulty of acquiring the emailed code - the token itself is the only real secret in the chain.
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
AC:H and UI:R because the attacker must obtain the victim's one-time code and the victim must verify an email change; PR:N as no attacker authentication is needed; C:H/I:H from full account takeover.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Craft CMS from 5.0.0 before 5.11.0 contains an authentication bypass vulnerability that allows attackers to reuse verification codes because users/verify-email does not invalidate them for active users. Attackers who obtain a victim's emailed code can submit it to users/set-password after the victim verifies an email change, resetting the password and taking over the account.
Technical POC Analysis
The bug is CWE-287 (Improper Authentication): two unauthenticated actions share one secret, but only one of them consumes it.
Full technical POC analysis - root cause, step-by-step exploitation and patch breakdown - is part of the Pro and Business plans.
Executive ViewAI
Craft CMS versions 5.0.0 through 5.10.x contain a high-severity account takeover flaw in the email verification and password reset workflow, putting site users-including privileged administrators-at risk if their one-time codes are obtained. Leadership should prioritize remediation because compromised accounts could enable unauthorized content changes, data exposure, or further access, though exploitation is targeted and requires specific conditions. No public exploit identified at time of analysis, and version 5.11.0 corrects the behavior.
Apply vendor patch.
Threat Intelligence Overview
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
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EUVD-2026-104581
GHSA-5779-r722-9gx9
NVD
CVE.org
EPSS
Exploit-DB