CVE-2026-55840Public exploitNetwork attack vectorHinoki check available

Phishing via hostname-prefix redirect validation

Published Oct 15, 2026 · Updated Oct 15, 2026

Open redirect in Erudika Scoold before 1.69.1 allows remote attackers to send users to an untrusted site via crafted sign-in links. HttpUtils.getBackToUrl() resolves backto and returnto values, then accepts absolute URLs whose strings begin with the configured server URL instead of checking their origin. A victim must follow the link and authenticate; the subsequent redirect enables phishing but does not itself establish credential or token theft.

CVSS severity5.4
Medium
EPSS probability0.26%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Open redirect in Erudika Scoold before 1.69.1 allows remote attackers to send users to an untrusted site via crafted sign-in links. HttpUtils.getBackToUrl() resolves backto and returnto values, then accepts absolute URLs whose strings begin with the configured server URL instead of checking their origin. A victim must follow the link and authenticate; the subsequent redirect enables phishing but does not itself establish credential or token theft.

The record

CVE
CVE-2026-55840
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
Erudika
Product
Scoold
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.69.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Erudika · Scooldversion=< 1.69.1

Published CVSS scores

5.4GitHub_MCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1566.002Spearphishing Link

Public exploit references

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Technologies

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