CVE-2025-47945Public exploitNetwork attack vector

Account takeover via weak default JWT secret

Published May 17, 2025 · Updated May 19, 2025

Authentication bypass in Donetick before 0.1.44 allows remote attackers to take over any account by forging a signed JWT. The JWT authentication configuration supplies a weak default HS256 signing secret, causing middleware to accept attacker-signed tokens carrying another username. Exploitation requires network access but no existing account or user interaction, and permits reading and modifying data as the impersonated user.

CVSS severity9.1
Critical
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Donetick before 0.1.44 allows remote attackers to take over any account by forging a signed JWT. The JWT authentication configuration supplies a weak default HS256 signing secret, causing middleware to accept attacker-signed tokens carrying another username. Exploitation requires network access but no existing account or user interaction, and permits reading and modifying data as the impersonated user.

The record

CVE
CVE-2025-47945
Published
May 17, 2025
Updated
May 19, 2025
Vendor
Donetick
Product
Donetick
Classifications
CWE-1188, CWE-453, T1606
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2025CVE publishedPublication date reported by the CVE source.
  2. May 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 0.1.44

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Donetick · Donetickversion=< 0.1.44

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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

No observations available

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

Weakness, pattern, technique

CWE-1188Initialization of a Resource with an Insecure Default
CWE-453Insecure Default Variable Initialization
T1606Forge Web Credentials

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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