How severe is CVE-2026-40255?

CVE-2026-40255 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-40255 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40255?

CVE-2026-40255 primarily affects Adonisjs Http-server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-40255?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40255 have an EU (EUVD) identifier?

Yes. CVE-2026-40255 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23320.

When was CVE-2026-40255 published?

CVE-2026-40255 was published on 2026-04-16 and last updated on 2026-06-17.

CVE-2026-40255

CVE-2026-40255 is a medium-severity vulnerability in Adonisjs Http-server with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23320
Weakness: CWE-601
Affected product: Adonisjs Http-server
Published: 2026-04-16
Last modified: 2026-06-17

Description

AdonisJS HTTP Server is a package for handling HTTP requests in the AdonisJS framework. In @adonisjs/http-server versions prior to 7.8.1 and 8.0.0-next.0 through 8.1.3, and @adonisjs/core versions prior to 7.4.0, the response.redirect().back() method reads the Referer header from the incoming HTTP request and redirects to that URL without validating the host.An attacker who can influence the Referer header can cause the application to redirect users to a malicious external site. This affects all AdonisJS applications that use response.redirect().back() or response.redirect('back'). This issue has been fixed in versions 7.8.1 and 8.2.0 and 7.4.0 of @adonisjs/core.

Frequently asked questions

What is CVE-2026-40255?: AdonisJS HTTP Server is a package for handling HTTP requests in the AdonisJS framework. In @adonisjs/http-server versions prior to 7.8.1 and 8.0.0-next.0 through 8.1.3, and @adonisjs/core versions prior to 7.4.0, the response.redirect().back() method reads the Referer header from the incoming HTTP request and redirects to that URL without validating the host.An attacker who can influence the Referer header can cause the application to redirect users to a malicious external site. This affects all AdonisJS applications that use response.redirect().back() or response.redirect('back'). This issue has been fixed in versions 7.8.1 and 8.2.0 and 7.4.0 of @adonisjs/core.
How severe is CVE-2026-40255?: CVE-2026-40255 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-40255 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40255?: CVE-2026-40255 primarily affects Adonisjs Http-server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-40255?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40255 have an EU (EUVD) identifier?: Yes. CVE-2026-40255 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23320.
When was CVE-2026-40255 published?: CVE-2026-40255 was published on 2026-04-16 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:adonisjs:http-server:*:*:*:*:*:node.js:*:*
cpe:2.3:a:adonisjs:core:*:*:*:*:*:node.js:*:*

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