VulnerabilityPublished 21 Apr 2026

CVE-2026-40588: blueprintue-self-hosted-edition · Unverified Password Change

Affects blueprintue-self-hosted-editionSource CVE Database V5

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Not known to be exploited · CVSS 8.1 High : upgrade to 4.2.0 soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

8.1High

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 18% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.2.0

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
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: None: The vulnerable system can be exploited without any interaction from any user.
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 21 Apr 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

Upgrade blueprintue-self-hosted-edition and blueprintue/blueprintue-self-hosted-edition to 4.2.0.

Affected software

Product	Affected	Fixed in
blueprintueblueprintue-self-hosted-edition	Affected <4.2.0	Fixed in 4.2.0
GitHubblueprintue/blueprintue-self-hosted-edition`pkg:github/blueprintue/blueprintue-self-hosted-edition`Other threats	Affected <4.2.0	Fixed in 4.2.0

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

AI-suggested

Upgrade blueprintue-self-hosted-edition to version 4.2.0 or later, where this vulnerability is fixed. Until upgrading, restrict access to authenticated sessions and protect session tokens to prevent unauthorized access. Patch status is not explicitly stated in vendor advisories but the fix is included in version 4.2.0.

Description

CVE-2026-40588 is a high-severity vulnerability in blueprintue-self-hosted-edition versions prior to 4.2.0. The password change form does not require verification of the current password, allowing an attacker with an authenticated session to change the password without knowing the original. This can lead to permanent account takeover. The vulnerability is fixed in version 4.2.0. No known exploits are reported in the wild.

Impact

An attacker with an authenticated session can change the account password without knowing the original password, leading to permanent account takeover. This compromises confidentiality and integrity of the affected user accounts. There is no impact on availability reported. No known exploits in the wild have been documented.

Summary

The blueprintue-self-hosted-edition before version 4.2.0 contains an unverified password change vulnerability (CWE-620). Specifically, the password change form at /profile/{slug}/edit/ lacks a current_password field and does not verify the user's existing password before accepting a new one. An attacker who has obtained a valid authenticated session—via methods such as XSS, session sidejacking over HTTP, physical access to a logged-in browser, or stolen 'remember me' cookies—can change the account password immediately, resulting in permanent account takeover. This issue is resolved in version 4.2.0.

CWE-620Unverified Password Change (opens in a new tab)
Base weaknessOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
When setting a new password for a user, the product does not require knowledge of the original password, or using another form of authentication.
Architecture and Design
When prompting for a password change, force the user to provide the original password in addition to the new password.
Architecture and Design
Do not use "forgotten password" functionality. But if you must, ensure that you are only providing information to the actual user, e.g. by using an email address or challenge question that the legitimate user already provided in the past; do not allow the current user to change this identity information until the…
OWASP Cheat Sheets
Choosing and Using Security Questions (opens in a new tab)
Forgot Password (opens in a new tab)
Credential Stuffing Prevention (opens in a new tab)
Authentication (opens in a new tab)
Transport Layer Protection (opens in a new tab)
OWASP ASVS 4.0.3
V2.1.6 (opens in a new tab)
V2.2.3 (opens in a new tab)
V2.1.5 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-73f2-p9jr-m44x (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Apr 2026, 11:41 UTC

WeaknessesCWE-620

Technical details

References

Community reviews

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