CVE-2026-78553

Local administrator session forgery via readable signing key

Published Aug 24, 2026 · Updated Aug 24, 2026

Incorrect default permissions in RansomLook 2.0.0 and earlier allow local users to forge administrator sessions by reading secret_key. The application creates its Flask signing-key file using process-default permissions and umask, which can leave the cryptographic secret readable by other local users. Access to the RansomLook home directory is required; the exposed key signs session cookies, and LDAP deployments accept forged usernames without requiring matching local users.

CVSS severity7.0
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect default permissions in RansomLook 2.0.0 and earlier allow local users to forge administrator sessions by reading secret_key. The application creates its Flask signing-key file using process-default permissions and umask, which can leave the cryptographic secret readable by other local users. Access to the RansomLook home directory is required; the exposed key signs session cookies, and LDAP deployments accept forged usernames without requiring matching local users.

The record

CVE
CVE-2026-78553
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
RansomLook
Product
RansomLook
Classifications
CWE-732, CWE-276, T1606.001, T1552.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 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=0 <=2.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

RansomLook · RansomLookversion=0 <=2.0.0

Published CVSS scores

7.0CIRCL ENISA rootCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
CWE-276Incorrect Default Permissions
T1606.001Forge Web Credentials: Web Cookies
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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